Glad to see another book to learn from for free. But my problem now is that there are so many books each with somewhat different approach and content for the sa

Glad to see another book to learn from for free. But my problem now is that there are so many books each with somewhat different approach and content for the same ML techniques. Not necessarily bad, but I get somewhat confused when trying to apply a method. EDIT: I guess the focus on the theory might help me.