Top 10 things to avoid as a beginner

[PixelRunner]

Personally, I would like to add Harmony z fighting
to the list. When you are trying to "invent" a chord, don't put a note one pitch higher than the other note. It doesn't have that "chord effect" Listen to the first measure vs the second measure of this:
##1553907
hopefully that shows a thumbnail lol. The first measure doesn't sound like harmony at all, it just sounds... flat out horrible! Compare that to the second measure, which actually sounds like an actual chord.