Easiest class?

[Jojoya]

I just want to press 3 buttons.

Any of them as long as you stick to content level 17 and under.

You could also try playing games where classes only have 3 actions to choose from. Last time I played Trove, classes only had 3 abilities (though gems could give those abilities special effects). I haven't played it in 4 years though, might have changed since.