Read Atomic Habits, a great book.
Quick tips I learned:
- Do 1% toward the end goal every day (wanna run 5k, start by walking 1k)
- Learning a new habit? Make it so it's minimal friction to pick it up (learning guitar, place it in the middle of the room so it's hard to miss)
- Wanna drop a bad habit? Make it more friction (wanna watch less tv, put batteries out of remote)