0:00 Introduction
0:19 Demonstration
1:31 Piano sound settings
2:31 Left hand chords
3:37 Add chord motion
4:46 Choose your time signature
5:36 Writing chord progressions
6:44 The best melody notes
8:10 How to compose a melody
9:50 Playing outside the chord notes
10:43 More chords
11:43 Voice leading

I don't know why, but there seem to be many many people on Youtube who like this kind of sad/relaxing ethereal piano music, so here's a quick tutorial for total beginners on writing and playing your very own piano pieces!