As the title says, I would like to start creating some games in android. I don't want to do it in unity or anything in 3D, just pure 2D games and I don't want to do anything complex, just something very simple.

Seems like the game "aa" is very popular, yet, so "empty", clean, simple and challenging. The new generation of games aka fully flat games seem to be very popular. Flat is my favorite design out there, and i'm sure many people agree.

So for conclusion: if you know any websites or videos where they teach the game development from scratch, share the link here. My aim is to make a 2D Flat Game similar to "Ketchapp"  developers (not promoting them, but you can google them).