This was supposed to be a short but the aspect ratio is wrong for that. In this video I show you the process to go from a blank project to a functioning platformer in under 3 minutes. I get some basic input, calculate movement, do some basic collisions, and then apply the movement. This is obviously not a completed game but rather the building block to get started.
DISCLAIMER: this footage is sped up, it actually took me 5 minutes to build this.