This is a collection of modern resources on various undergrad level computer science topics, for someone with an interest in theory. Use WorldCat or LibGen if you can’t buy these books. You don’t have to do everything here, just whatever interests you. If I list a resource here it’s because I either completed the whole resource or I used parts of it for something I needed to learn and found it a quality enough resource to include here for somebody else who wants deeper coverage of these topics.