General advice:

• If you need a melody quick just use the black keys. You know the PS2 start up sound? That’s literally all the black keys smashed at the same time. But don’t be afraid to venture out sometimes. The occasional out-of-key note is good, actually.
• Repetition is your friend. Not just because ez but its how you make all music. The more advance stuff is secretly just repetition of more things.
• Make your track feel like its progressing by adding one element in, like, the second half. Can just be an extra note tbh.
• You don’t need a lot going on. Simple is cool and good. More notes is more ways to fuck up and more mess to clean.
• When you want to the track to feel like its ending just, remove some instruments from the last section.
• The most important note is the last one (for each section). Make that one good.

Math advice:

• Everything is made up of 2’s. Chords are root note (1), middle (3), Dominant (5). You can just keep adding twos if you want lmao.
• Sections, measures, and bars, all made of 2’s. Sometimes two 2’s. Every section should be played twice, except the last one.

Lastly, everything I said can be broken. But each one you break is a chance for a mess.