These are fairly old cliff-notes I wrote down a few years back on jQuery and JavaScript,
jQuery
JavaScript & AJAX

Feel free to take a look (if applicable) and review the source code underneath each example.

Visual QuickStart Guides can be found here:
jQuery: Visual QuickStart Guide
JavaScript and Ajax for the Web: Visual QuickStart Guide (7th Edition)

All the asynchronous callbacks in which DevTools will display the full call stack:

• Timers
• XHRs
• Animation frames
• Event listeners
• MutationObservers

Thanks to, html5rocks.

Common HTML and CSS miscues as explained by WTF, HTML and CSS?.

• Declare a doctype
• Box model math
• Rem units and Mobile Safari
• Floats first
• Floats and clearing
• Floats and computed height
• Floated are block level
• Vertical margins often collapse
• Styling table rows
• Firefox and <input> buttons
• Firefox inner outline on buttons
• Always set a type on <button>s
• Internet Explorer’s selector limit
• Position explained
• Position and width
• Fixed position and transforms

Thanks to, CSS Weekly #103 and WTF, HTML and CSS?.