Beginner at everything Midi music

So I was roaming around the net finding a hobby and midi music caught my attention, specifically music made in Beepbox cause I heard a few creators from youtube used the site and been listening to them nonstop whenever I'm idling.
I felt inspired to make my own but I have zero knowledge on both music theory and on what foot should I start on before I start making simple bangers. Been looking through Youtube but I don't see much tutorials on how to make music on Beepbox with all the foreign terminology. Any tips on firsts?