Learning to program on the HP Prime (intermediate to advanced)

[Grayhek]

I have learned to program quite a bit while taking my ChemE courses but it has been quite difficult finding good help on things that aren't clear or are not even in the user manual for the HP Prime (this forum is very helpful). What I would like to know is if there are any materials or courses that teach you how to program better for the HP Prime or is it just trial and error? I see some people make amazing programs and apps for the Prime but I have no idea how they learned to do all of that stuff. If someone could point me to some learning materials that would be much appreciated.