Oh and one more thing... I could go on and on about stuff like this so stop me if you get sick of me. But I had one more tip.

Its about Filters. Whatever app you choose they all have different filters that you can use to render a picture in a "cool" way. Allot of tutorials out there will tell you to use filters since they are quick and easy. And require essentially no skill.
This is a shortcut that allot of people over use when discovering them for the first time. In the long run it only gets in the way since one gets dependent on them not having to learn how to do it with the "normal" tools.

I guess this is more of a warning than a tip. But in the long run one benefits allot from just using the brushes, since it forces one to do stuff "the hard way".