For making a game which coarse is better c++ or other

Answer 1

Sololearn courses can only teach you basics of the language, for the focused implementation part(game dev in your case) you have to learn a bit more than what sololearn course has to offer you.

Answer 2

Just use a game engine like Godot. Making a game from scratch is neither easy or fast and in 99% of cases you'll end up with a mess instead of a game.

Answer 3

Which coarse u have done till now