React: Class Based Components: fix grammar

javascript/computer_science/a_very_brief_intro_to_cs.md

@@ -22,18 +22,16 @@ This section contains a general overview of topics that you will learn in this l
 <div class="lesson-content__panel" markdown="1">
   1. Watch [Introduction to Algorithms by David Malan](http://ed.ted.com/lessons/your-brain-can-solve-algorithms-david-j-malan) on TedEd to see how to think about algorithms.
   2. Watch [What is an Algorithm?](https://youtu.be/e_WfC8HwVB8) on YouTube for a more structured look at solving problems using algorithms.
-  3. Read [this Quora question about the importance of algorithms in web development](http://www.quora.com/Algorithms/What-is-the-importance-of-algorithms-in-web-development) to get some context for why we're going over this stuff.
+  3. Read [this Quora answer about the importance of algorithms in web development](https://qr.ae/py3NAc) to get some context for why we're going over this stuff.
   4. Watch [What is pseudocode?](https://www.youtube.com/watch?v=Rg-fO7rDsds)
 </div>
 
-
-
 ### Knowledge check
 
 This section contains questions for you to check your understanding of this lesson on your own. If you’re having trouble answering a question, click it and review the material it links to.
 
 - [What is an Algorithm?](https://youtu.be/e_WfC8HwVB8)
-- [What is the importance of algorithms in web development?](http://www.quora.com/Algorithms/What-is-the-importance-of-algorithms-in-web-development)
+- [What is the importance of algorithms in web development?](https://qr.ae/py3NAc)
 - [What is pseudocode?](https://www.youtube.com/watch?v=Rg-fO7rDsds)
 
 ### Additional resources

react/class_components/class_based_components.md

@@ -12,7 +12,7 @@
 
 ### Historical React component patterns
 
-In your previous lessons, you have already been introduced to functional components, and the basic patterns in which components get written now a days. However, React components did not look this way when React was introduced.
+In your previous lessons, you have already been introduced to functional components, and the basic patterns in which components get written nowadays. However, React components did not look this way when React was introduced.
 
 If you look into any older React codebase, you'll notice a lot of classes. These are known as class-based components. Prior to February 2019, functional components were also called state-less, as there was no way to manage state in them. This was changed when hooks were introduced, leading to less verbose and 'neater' components.
 
@@ -20,7 +20,7 @@
 
 ### Building a class component
 
 As we already know about functional components, let us build a class-based component from a functional one. Usually, you will want to divide the contents of a component, like the one we use, into smaller, re-usable components, but for the purposes of this exercise, we stick to one component. Below, we have a sample functional component:
 
 ~~~jsx
 import React, { useState } from "react";

ruby/computer_science/a_very_brief_intro_to_cs.md

@@ -11,6 +11,7 @@ We're taking a look at some more Computer Science-y concepts here because they a
 If that doesn't get you interested, remember that this curriculum is meant to prepare you for life beyond the web page. If you're interested in applying for a job, you'll be asked questions that directly touch on some of this stuff.  It's going to require you to put on your thinking cap (sorry, it had to happen sometime), but we won't be doing anything too crazy. We'll stick to the practical side of this material as opposed to getting too stuck in theory.
 
 ### Learning outcomes
+
 Look through these now and then use them to test yourself after doing the assignment:
 
 * What is an algorithm?
@@ -21,20 +22,22 @@ Look through these now and then use them to test yourself after doing the assign
 <div class="lesson-content__panel" markdown="1">
   1. Watch [Introduction to Algorithms by David Malan](http://ed.ted.com/lessons/your-brain-can-solve-algorithms-david-j-malan) on TedEd to see how to think about algorithms.
   2. Watch [What is an Algorithm?](https://youtu.be/e_WfC8HwVB8) on YouTube for a more structured look at solving problems using algorithms.
-  3. Read [this Quora question about the importance of algorithms in web development](http://www.quora.com/Algorithms/What-is-the-importance-of-algorithms-in-web-development) to get some context for why we're going over this stuff.
+  3. Read [this Quora answer about the importance of algorithms in web development](https://qr.ae/py3NAc) to get some context for why we're going over this stuff.
   4. Watch [What is pseudocode?](https://www.youtube.com/watch?v=Rg-fO7rDsds)
 </div>
 
 ### Additional resources
+
 This section contains helpful links to other content. It isn't required, so consider it supplemental.
 
 * [Wikipedia on Computer Science](http://en.wikipedia.org/wiki/Computer_science)
 * [Wikipedia on Algorithms](http://en.wikipedia.org/wiki/Algorithm)
 * [Map of Computer Science](https://youtu.be/SzJ46YA_RaA)
 
 ### Knowledge check
+
 This section contains questions for you to check your understanding of this lesson. If you’re having trouble answering the questions below on your own, review the material above to find the answer.
 
 * <a class="knowledge-check-link" href="https://youtu.be/e_WfC8HwVB8">What is an Algorithm?</a>
-* <a class="knowledge-check-link" href="http://www.quora.com/Algorithms/What-is-the-importance-of-algorithms-in-web-development">What is the importance of algorithms in web development?</a>
+* <a class="knowledge-check-link" href="https://qr.ae/py3NAc">What is the importance of algorithms in web development?</a>
 * <a class="knowledge-check-link" href="https://www.youtube.com/watch?v=Rg-fO7rDsds">What is pseudocode?</a>