1. Commenting & Documentation
IDE’s (Integrated Development Environment) have come a long way in the past few years. This made commenting your code more useful than ever. Following certain standards in your comments allow IDE’s and other tools to utilize them in different ways.
Take this example:

The comments I added at the function definition can be previewed whenever I use that function, even from other files.
» Read more: [HTML Tutorial] Top 15+ Best Practices for Writing Super Readable Code