I know a lot of people struggle with them. I am tired of "tutorials" that give an outline on how to make a cookie-cutter version of what someone else does: those are not useful except to replicate an effect someone else already uses! Those will not help a whole lot, and I've made ones like that in the past. This is more like a TLDR version of something that will be in my color book when it's ready, using a speedpaint from the Pal/Palette story as an example.
This simply offers things to think about with some examples of each of the things: more detail can be covered on each of these aspects, undoubtedly, but this is just a general advice thing. I will make a more detailed one when it comes to my book, with several examples on composing backgrounds and how to approach that. I favor teaching how to critically think about your work rather than giving a tip on exactly how to work like someone!
Feel free to ask questions + address things I wasn't able to cover in depth here: I'll try to give a response over time, and it will give me things to think about for the better version
Here on tumblr for easy sharing: [link]