diff --git a/.eslintrc.json b/.eslintrc.json
index a2a145dc2e..3921b8dec7 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,6 +1,6 @@
 {
   "extends": ["plugin:react/recommended", "@freecodecamp/eslint-config"],
-  "rules": { "no-shadow": 0 },
+  "rules": { "no-shadow": 0, "react/no-unescaped-entities": 0 },
   "settings": {
     "react": {
       "version": "16.4.2"
diff --git a/client/plugins/fcc-create-nav-data/create-navigation-node.test.js b/client/plugins/fcc-create-nav-data/create-navigation-node.test.js
index 2f6e7d71f0..50fbb80d3f 100644
--- a/client/plugins/fcc-create-nav-data/create-navigation-node.test.js
+++ b/client/plugins/fcc-create-nav-data/create-navigation-node.test.js
@@ -43,13 +43,21 @@ describe('fcc-create-nav-data', () => {
       expect(result.dashedName).equal('file-writing');
     });
 
-    it('node.path should equal the file path from pagesDir, prefixed with `/guide`', () => {
-      expect(result.path).to.equal('/guide/php/functions/files/file-writing');
-    });
+    it(
+      'node.path should equal the file path from pagesDir, ' +
+        'prefixed with `/guide`',
+      () => {
+        expect(result.path).to.equal('/guide/php/functions/files/file-writing');
+      }
+    );
 
-    it('node.parentPath should equal the path of the parent page, prefixed with `/guide`', () => {
-      expect(result.parentPath).to.equal('/guide/php/functions/files');
-    });
+    it(
+      'node.parentPath should equal the path of the parent page, ' +
+        'prefixed with `/guide`',
+      () => {
+        expect(result.parentPath).to.equal('/guide/php/functions/files');
+      }
+    );
 
     it('node.title should equal srcNode.frontmatter.title', () => {
       expect(result.title).to.equal(mockNode.frontmatter.title);
diff --git a/client/src/client-only-routes/ShowSettings.js b/client/src/client-only-routes/ShowSettings.js
index 4737d519c8..65d32cbe32 100644
--- a/client/src/client-only-routes/ShowSettings.js
+++ b/client/src/client-only-routes/ShowSettings.js
@@ -258,7 +258,6 @@ function ShowSettings(props) {
             verifyCert={verifyCert}
           />
           <Spacer />
-          {/* <DangerZone /> */}
         </main>
       </Grid>
     </Fragment>
diff --git a/client/src/components/Donation/components/DonateForm.js b/client/src/components/Donation/components/DonateForm.js
index e133a04374..f3a798cd63 100644
--- a/client/src/components/Donation/components/DonateForm.js
+++ b/client/src/components/Donation/components/DonateForm.js
@@ -21,6 +21,7 @@ import { userSelector, isSignedInSelector } from '../../../redux';
 
 const propTypes = {
   email: PropTypes.string,
+  isSignedIn: PropTypes.bool,
   stripe: PropTypes.shape({
     createToken: PropTypes.func.isRequired
   })
@@ -120,9 +121,9 @@ class DonateForm extends Component {
       }
     }));
 
-    const chargeStripePath = isSignedIn ?
-      `/internal/donate/charge-stripe` :
-      `${apiLocation}/unauthenticated/donate/charge-stripe`;
+    const chargeStripePath = isSignedIn
+      ? `${apiLocation}/internal/donate/charge-stripe`
+      : `${apiLocation}/unauthenticated/donate/charge-stripe`;
     return postJSON$(chargeStripePath, {
       token,
       amount
@@ -151,7 +152,7 @@ class DonateForm extends Component {
   }
 
   resetDonation() {
-    return this.setState({...initialState});
+    return this.setState({ ...initialState });
   }
 
   renderCompletion(props) {
diff --git a/client/src/components/Footer/index.js b/client/src/components/Footer/index.js
index e36c893045..f93545a431 100644
--- a/client/src/components/Footer/index.js
+++ b/client/src/components/Footer/index.js
@@ -1,14 +1,22 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 import { Link as GatsbyLink } from 'gatsby';
 import { Grid, Row, Col } from '@freecodecamp/react-bootstrap';
 
 import './footer.css';
 
+const propTypes = {
+  children: PropTypes.any,
+  external: PropTypes.bool,
+  to: PropTypes.string.isRequired
+};
+
 const ColHeader = ({ children, ...other }) => (
   <div className='col-header' {...other}>
     {children}
   </div>
 );
+ColHeader.propTypes = propTypes;
 
 const Link = ({ children, to, external, ...other }) => {
   if (!external && (/^\/(?!\/)/).test(to)) {
@@ -25,6 +33,7 @@ const Link = ({ children, to, external, ...other }) => {
     </a>
   );
 };
+Link.propTypes = propTypes;
 
 function Footer() {
   return (
diff --git a/client/src/components/Map/components/Block.js b/client/src/components/Map/components/Block.js
index eab7378195..052f3dd8c7 100644
--- a/client/src/components/Map/components/Block.js
+++ b/client/src/components/Map/components/Block.js
@@ -109,7 +109,13 @@ export class Block extends Component {
   }
 
   render() {
-    const { blockDashedName, completedChallenges, challenges, isExpanded, intro } = this.props;
+    const {
+      blockDashedName,
+      completedChallenges,
+      challenges,
+      isExpanded,
+      intro
+    } = this.props;
     let completedCount = 0;
     const challengesWithCompleted = challenges.map(challenge => {
       const { id } = challenge;
diff --git a/client/src/components/formHelpers/index.js b/client/src/components/formHelpers/index.js
index ec9c9e182c..41e5377d6a 100644
--- a/client/src/components/formHelpers/index.js
+++ b/client/src/components/formHelpers/index.js
@@ -65,7 +65,7 @@ export function getValidationState(field) {
     return null;
   }
 
-  if (/https?:\/\/glitch\.com\/edit\/#!\/.*/g.test(field.value)) {
+  if ((/https?:\/\/glitch\.com\/edit\/#!\/.*/g).test(field.value)) {
     return 'glitch-warning';
   }
 
diff --git a/client/src/components/settings/Certification.js b/client/src/components/settings/Certification.js
index a595f65e20..b7d7ad4456 100644
--- a/client/src/components/settings/Certification.js
+++ b/client/src/components/settings/Certification.js
@@ -78,12 +78,8 @@ const isCertMapSelector = createSelector(
     is2018DataVisCert,
     isApisMicroservicesCert,
     isJsAlgoDataStructCert,
-    isBackEndCert,
-    isDataVisCert,
-    isFrontEndCert,
     isInfosecQaCert,
     isFrontEndLibsCert,
-    isFullStackCert,
     isRespWebDesignCert
   }) => ({
     'Responsive Web Design': isRespWebDesignCert,
diff --git a/client/src/head/favicons.js b/client/src/head/favicons.js
index 6e05fb5071..06a3f579d5 100644
--- a/client/src/head/favicons.js
+++ b/client/src/head/favicons.js
@@ -3,32 +3,53 @@ import React from 'react';
 const favicons = [
   <link
     href='/assets/apple-touch-icon.png'
+    key='/assets/apple-touch-icon.png'
     rel='apple-touch-icon'
     sizes='180x180'
   />,
   <link
     href='/assets/favicon-32x32.png'
+    key='/assets/favicon-32x32.png'
     rel='icon'
     sizes='32x32'
     type='image/png'
   />,
   <link
     href='/assets/android-chrome-192x192.png'
+    key='/assets/android-chrome-192x192.png'
     rel='icon'
     sizes='192x192'
     type='image/png'
   />,
   <link
     href='/assets/favicon-16x16.png'
+    key='/assets/favicon-16x16.png'
     rel='icon'
     sizes='16x16'
     type='image/png'
   />,
-  <link href='/assets/site.webmanifest' rel='manifest' />,
-  <link color='#006400' href='/assets/safari-pinned-tab.svg' rel='mask-icon' />,
-  <meta content='#006400' name='msapplication-TileColor' />,
-  <meta content='/assets/mstile-144x144.png' name='msapplication-TileImage' />,
-  <meta content='#006400' name='theme-color' />
+  <link
+    href='/assets/site.webmanifest'
+    key='/assets/site.webmanifest'
+    rel='manifest'
+  />,
+  <link
+    color='#006400'
+    href='/assets/safari-pinned-tab.svg'
+    key='/assets/safari-pinned-tab.svg'
+    rel='mask-icon'
+  />,
+  <meta
+    content='#006400'
+    key='msapplication-TileColor'
+    name='msapplication-TileColor'
+  />,
+  <meta
+    content='/assets/mstile-144x144.png'
+    key='msapplication-TileImage'
+    name='msapplication-TileImage'
+  />,
+  <meta content='#006400' key='theme-color' name='theme-color' />
 ];
 
 export default favicons;
diff --git a/client/src/head/meta.js b/client/src/head/meta.js
index c614950b8f..bb788268a9 100644
--- a/client/src/head/meta.js
+++ b/client/src/head/meta.js
@@ -1,16 +1,22 @@
 import React from 'react';
 
 const meta = [
-  <meta charSet='utf-8' />,
-  <meta content='IE=edge' httpEquiv='X-UA-Compatible' />,
-  <meta content='width=device-width, initial-scale=1.0' name='viewport' />,
-  <meta content='summary_large_image' name='twitter:card' />,
+  <meta charSet='utf-8' key='charset' />,
+  <meta content='IE=edge' httpEquiv='X-UA-Compatible' key='IE=edge' />,
+  <meta
+    content='width=device-width, initial-scale=1.0'
+    key='viewport'
+    name='viewport'
+  />,
+  <meta content='summary_large_image' key='twitter:card' name='twitter:card' />,
   <meta
     content='https://s3.amazonaws.com/freecodecamp/curriculum-diagram-full.jpg'
+    key='https://s3.amazonaws.com/freecodecamp/curriculum-diagram-full.jpg'
     name='twitter:image:src'
   />,
   <meta
     content='https://s3.amazonaws.com/freecodecamp/curriculum-diagram-full.jpg'
+    key='https://s3.amazonaws.com/freecodecamp/curriculum-diagram-full.jpg'
     property='og:image'
   />
 ];
diff --git a/client/src/head/preloads.js b/client/src/head/preloads.js
index f3c4647cb3..c38f582a4f 100644
--- a/client/src/head/preloads.js
+++ b/client/src/head/preloads.js
@@ -1,14 +1,9 @@
 import React from 'react';
 import styleSheets from './styleSheets';
 
-const preloads = styleSheets.map((styleSheet, i) => (
-  <React.Fragment>
-    <link
-      as='style'
-      href={styleSheet.props.href}
-      key={`preload-${i}`}
-      rel='preload'
-    />
+const preloads = styleSheets.map(styleSheet => (
+  <React.Fragment key={`preload-${styleSheet.props.href}`}>
+    <link as='style' href={styleSheet.props.href} rel='preload' />
     {styleSheet}
   </React.Fragment>
 ));
diff --git a/client/src/head/scripts.js b/client/src/head/scripts.js
index dbf3da2f4a..09c3064fbd 100644
--- a/client/src/head/scripts.js
+++ b/client/src/head/scripts.js
@@ -3,6 +3,7 @@ import React from 'react';
 const scripts = [
   <script
     async=''
+    key='https://www.googletagmanager.com/gtag/js?id=AW-795617839'
     src='https://www.googletagmanager.com/gtag/js?id=AW-795617839'
   />
 ];
diff --git a/client/src/head/styleSheets.js b/client/src/head/styleSheets.js
index 3e87245b43..0ede0cef81 100644
--- a/client/src/head/styleSheets.js
+++ b/client/src/head/styleSheets.js
@@ -1,8 +1,3 @@
-import React from 'react';
-
-const styleSheets = [
-  // bootstrap v3.3.7
-  <link href='/bootstrap3/css/bootstrap.min.css' rel='stylesheet' />
-];
+const styleSheets = [];
 
 export default styleSheets;
diff --git a/client/src/resources/honesty-policy.js b/client/src/resources/honesty-policy.js
index 3233f799fc..ec542c858f 100644
--- a/client/src/resources/honesty-policy.js
+++ b/client/src/resources/honesty-policy.js
@@ -1,43 +1,43 @@
 import React from 'react';
 
 const policy = [
-  <p>
+  <p key={1}>
     Before we issue our verified certification to a camper, he or she must
     accept our Academic Honesty Pledge, which reads:
   </p>,
-  <p>
+  <p key={2}>
     "I understand that plagiarism means copying someone else’s work and
     presenting the work as if it were my own, without clearly attributing the
     original author."
   </p>,
-  <p>
+  <p key={3}>
     "I understand that plagiarism is an act of intellectual dishonesty, and that
     people usually get kicked out of university or fired from their jobs if they
     get caught plagiarizing".
   </p>,
-  <p>
+  <p key={4}>
     "Aside from using open source libraries such as jQuery and Bootstrap, and
     short snippets of code which are clearly attributed to their original
     author, 100% of the code in my projects was written by me, or along with
     another camper with whom I was pair programming in real time."
   </p>,
-  <p>
+  <p key={5}>
     "I pledge that I did not plagiarize any of my freeCodeCamp.org work. I
     understand that freeCodeCamp.org’s team will audit my projects to confirm
     this."
   </p>,
-  <p>
+  <p key={6}>
     In the situations where we discover instances of unambiguous plagiarism, we
     will replace the camper in question’s certification with a message that
     "Upon review, this account has been flagged for academic dishonesty."
   </p>,
-  <p>
+  <p key={7}>
     As an academic institution that grants achievement-based certifications, we
     take academic honesty very seriously. If you have any questions about this
     policy, or suspect that someone has violated it, you can email{' '}
     <a href='mailto:team@freecodecamp.org'>team@freecodecamp.org</a>
     &thinsp;and we will investigate.
   </p>
-].map((el, i) => ({...el, key: `honesty-${i}`}));
+];
 
 export default policy;
diff --git a/client/src/templates/Challenges/components/Preview.js b/client/src/templates/Challenges/components/Preview.js
index 2e8593846e..78c517b083 100644
--- a/client/src/templates/Challenges/components/Preview.js
+++ b/client/src/templates/Challenges/components/Preview.js
@@ -47,7 +47,11 @@ class Preview extends Component {
     const iframeToggle = this.state.iframeStatus ? 'disable' : 'enable';
     return (
       <div className={`challenge-preview ${iframeToggle}-iframe`}>
-        <iframe className={'challenge-preview-frame'} id={mainId} title='Challenge Preview'/>
+        <iframe
+          className={'challenge-preview-frame'}
+          id={mainId}
+          title='Challenge Preview'
+        />
       </div>
     );
   }
diff --git a/client/src/templates/Introduction/Intro.js b/client/src/templates/Introduction/Intro.js
index 566769573e..6abd63189c 100644
--- a/client/src/templates/Introduction/Intro.js
+++ b/client/src/templates/Introduction/Intro.js
@@ -52,7 +52,10 @@ function IntroductionPage({ data: { markdownRemark, allChallengeNode } }) {
           />
         </FullWidthRow>
         <FullWidthRow>
-          <Link className='btn btn-lg btn-primary btn-block' to={firstLessonPath}>
+          <Link
+            className='btn btn-lg btn-primary btn-block'
+            to={firstLessonPath}
+            >
             Go to the first lesson
           </Link>
           <ButtonSpacer />