IMO, the best way to "get into" music is just to learn music from people you like and then your own stuff will take shape after you get fluent with the patterns that inspire you based on the work you have learned. I find "getting into" music as a purely emotionless theoretical excursive to be a non-starter.
In piano, for example, you'll find lots of cats doing cool videos on how some of these chord thickening patterns work, and a lot of it is sort of beyond theory and a little bit more about patterns and frameworks that they have developed, but that insight has come from many hours of learning other peoples work and then developing patterns of there own via improv.