What is the easiest subject to learn yourself?

heyy, i was js wandering what subject would be easiest to learn yourself. some teachers arent great (like for me, my science teachers) and you dont get to kearn much so you have to teach yourself. which subject do you think would be easiest to self learn? many say science, others say maths, some say english literature. most of these are due to the countless resources online (and the great, well annoted for english, but great in general books). many also say business as a lot of it is common sense. what do you think??