YouTube
I most regularly post my music to YouTube, though I don't post often. I'm not great with the video aspect of the music videos, but I have been trying to get better and experiment with different things to display while music is happening.. I'm learning.
BandLab
I treat this like a github of music, posting the prototypes of my music while i work on it. If you're interested in hearing my music in a proto stage, check my out on bandlab.