This is not to say that there aren't people out there who just went trough jQuery basics (i.e. how to implement it on a web page) and are using simple jQuery functionality (i.e. show/hide for html elements) or adding jQuery plugins to their web pages.
- I suggest you go trough as many items in the list on the right.
Not sure what I would recommend as a starting point for jQuery (perhaps try a few 'jQuery for beginners' Youtube videos), but I can sure say that after you take that first step, jQuery API documentation is a very good reference guide: