Update guides

public/index.html

@@ -80,6 +80,21 @@ You may be using [Markdown Live Preview](https://markdownlivepreview.com/).
 >
 >> Markdown is often used to format readme files, for writing messages in online discussion forums, and to create rich text using a plain text editor.
 
+## Tables
+
+| Left columns  | Right columns |
+| ------------- |:-------------:|
+| left foo      | right foo     |
+| left bar      | right bar     |
+| left baz      | right baz     |
+
+## Blocks of code
+
+```
+let message = 'Hello world';
+alert(message);
+```
+
 ## Inline code
 
 This web site is using `markedjs/marked`.</textarea>