I learned nothing in 61A — because I was a dumbass kid and didn’t take it seriously. 61B made me feel like I knew how to program. 61C taught me how computers

I learned nothing in 61A — because I was a dumbass kid and didn’t take it seriously. 61B made me feel like I knew how to program. 61C taught me how computers work. A decade or so later 61A is actually the most useful of the 3 courses now that I’m mid career. I might recommend that you take 61b first before the other 2 if you’re just starting out