As an undergrad you typically need minimal coursework. The reason is anything you learn in an intro course won't scrape the surface of any research project. Your PI is very far down a rabbit hole. When you join the lab (s)he'll assign you a bunch of journal articles to read which will catch you up to speed. Your tasks will generally be straightforward and you will get told exactly what to do when getting trained. For example, many labs have folders of SOPs for each of their assays.