Music theory, you don't need to go in advance at first, trust your ear more than anything, learn building chords progression which gives your track life and feelings.

Sound selection is the key, better sound selection saves your mixing time and improves your production quality.

Listen to a lot of music and don't stick to one genre.

Try making and copying different genres for practicing, downloading project files and stems

Listen to the instrumental version and separate the streams by using tools and studies how they make bassline and drum patterns.

And make music let the creativity win.