Habit pairing or habit stacking is when you take one thing you do regularly and pair it with another activity. So you could exercise when you watch TV, stretch while brushing your teeth, study on the train or bus, listen to podcasts in the car, review flashcards before bed, etc.
Using habit pairing to learn Korean is a good way to integrate study in with your daily life and keep it up! I know some days you can’t sit down for a full study session and that’s okay. Even small, quick habits can make sure you maintain your Korean and still learn. I’ll get into some habits I have and some ideas to get you inspired!