This is a video that a lot of people have asked for. I think that there's a lack of good video tutorials so hopefully this helps some people out. There's not really a ton to be said about improvement in typing, as 99% of it is just practice. Ok now here's a ton of links:

Key rollover test: http://gadzikowski.com/nkeyrollover.html

Nitro Type: https://www.nitrotype.com/

Type Racer: https://play.typeracer.com/

10 Fast Fingers: https://10fastfingers.com/

Monkey Type: https://monkeytype.com/

Colemak typists that I mentioned:

Viper:    / @xayiver9529  

Sophie:    / @poppetx  

Jashe:    / @jashepoon