since I have started learning jQuery I learned a lot. However one of my weakest side in working with jQuery is that I don't know how to debug the code and find mistakes and problems.

Specially in a big project where many different JavaScript files are in use, it's very difficult to find the part of code which causes the problem.

Is there any book, or tutorial which explains the right way for debugging and finding JavaScript (jQuery) problems? Especially in a larger project?

Are any tools or plugins which can help finding JavaScript or jQuery issues?

Thanks