What are some tricks that can make a web developer's job easier?

 jQuery  is the most useful java script framework that's helping the web designer, you can start learning easily from websites like code.org According to me and IDEA is priceless and core of the technology.

1. Google about ur Problems
2. splitting your code and problems to small pieces, which are easy to trace and solve
3. Join an Online Developer Community
4. Utilize Plugins and Extensions
5. Bookmark the Right Online Resources
6. Don't Stress Over the Small Things

Yes there are a lot of tricks like for example you can use libraries instead of writing native, Example: jQuery instead of writing javascript native, Also you can use IDE which will help you writing codes and make it easier to avoid errors, and you can use CMSs like WordPress it is much easier and faster to build a websites for a clients.

The best trick is to gain as much expertise as possible.