There are so many resources out there that it's hard to know where to begin! You could check out our Best Amazon FBA Courses guide for some excellent, popular courses that will give you a good idea of the basics as well as some more advanced tips on how to increase sales. You can find free resources online, but make sure you look for courses and tutorials that are up-to-date. The eCommerce world changes fast, so there's no point in learning outdated information.