I use atar notes, there’s a yearly subscription where you can get all the books. I find it good for supplementing knowledge succinctly (especially around exams so I get the key points), but wouldn’t recommend using it alone. if you get the subscription, you’ll also get the practice question books, which are also quite helpful imo. It really depends on your preference, and altho I haven’t come across errors (that I know of…) that doesn’t mean there aren’t any.