Here are the primary sources we suggest for documentation and reference. If they seem overwhelming at first, don't be deterred. As your knowledge and ability grow, so too will your ability to navigate the documentation and resources.
The official jQuery site has great documentation on all of the methods and tools that are available when you use the jQuery library.
Stack Overflow is a good resource for finding answers to specific challenges that you are facing. It's a site for asking and answering questions about programming. You do need to be careful about what you find there, as there is plenty of bad information to go along with the good. Make sure to search to see if somebody has already answered your question before posting. And double-check that any posts you're referencing are fairly recent (technology changes quickly!) Also, give back by answering questions for other people!