[Sabrina] Fix formatting errors, typos, wrong link

Author: sabrina-s

docs/fundamentals/how-to-learn.md

@@ -97,8 +97,7 @@ There is also a famous book named [How to Read a Book](https://www.amazon.com/Ho
 - use it like a dictionary. know the structure. know where to find things
 - find the API docs (e.g. MDN is great for JavaScript)
 - figure out what you want to do (e.g. split a string into an array)
-- zoom in to the right place in the docs (e.g. .split()) (google is always helpful) - Understand the method - what it does - what parameters it takes in - what should the parameters look like (e.g. string, number, array, object, etc.?) - which parameters are required / optional? - what the return value is
-  pause when confused
+- zoom in to the right place in the docs (e.g. `.split()`) (Google is always helpful) - understand the method, what it does, what parameters it takes in, what the parameters should look like (e.g. string, number, array, object, etc.), which parameters are required/optional, what the return value is
 
 ## Don't be afraid of making mistakes. Embrace failures.
 

docs/fundamentals/http.md

@@ -92,7 +92,7 @@ User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
 `GET /index.html HTTP/1.1` is called the _request line_.
 `Host: www.example.com`, `User-Agent: Mozilla/4.0` are some of the _request headers_ that exist in the HTTP request. HTTP Headers are key-value pairs that are separated by a colon.
 
-You can find a list of valid headers on [MDN’s HTTP Headers Reference](https://www.smashingmagazine.com/2018/01/understanding-using-rest-api/).
+You can find a list of valid headers on [MDN's HTTP Headers Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers).
 
 ### Response
 

docs/html&css/html.md

@@ -195,9 +195,8 @@ HTML5 gives us semantic tags that have built-in keyboard accessibility — they
 
 Using these various HTML elements to reinforce the meaning of information on our websites will often give us accessibility for free.
 
-you can read more about it here:
+You can read more about it here:
 
-https://developer.mozilla.org/en-US/docs/Learn/Accessibility/HTML
-http://www.html5accessibility.com/
-
-https://developer.chrome.com/apps/a11y
+- https://developer.mozilla.org/en-US/docs/Learn/Accessibility/HTML
+- http://www.html5accessibility.com/
+- https://developer.chrome.com/apps/a11y

docs/javascript/classes.md

@@ -112,7 +112,7 @@ console.log(bob.name);
 
 It is an [experimental feature, available with Node 12](https://github.com/tc39/proposal-class-fields).
 
-You can read the [d]ocumentation at MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Class_fields#Public_fields).
+You can read the [documentation at MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Class_fields#Public_fields).
 
 ## Static Properties
 

docs/javascript/node-modules.md

@@ -56,7 +56,7 @@ var sum = math.add(1, 2); //sum is 3
 How do you export a function but not export it inside an object? You can use the `module` object to do this.
 It contains information about the module and also a key called `exports`.
 
-The `exports` object you youre using previously points to exports key on the `module` object.
+The `exports` object you were using previously points to exports key on the `module` object.
 
 Exporting a function as `exports.add` is the same as exporting it as `module.exports.add`.