This is great! I'm not a user but, with all this hubub I am feeling like I should try it over the weekend or lunch (I do abstract art). Everyone that seems to use the software has given glowing reviews.
https://www.youtube.com/watch?v=hEAs-UMLB90
It's in French but you can enable English subtitles and those seem pretty good.
As for getting better as an artist in my opinion nothing beats just practicing a bit everyday and knowing what your tools can do for you. Having some knowledge about fundamentals like composition, balance and color harmonies will also help a lot. You can find a ton of tutorials about these subjects on youtube.
Edit: I just noticed that the second part of the course doesn't have any subtitles yet. It's a shame but it's probably still worth quickly scrolling through it to get an idea about what the software can do.