Repetition … and repetition in multiple formats

Repeat what you want to remember
Repeat inside your thoughts
Repeat it out loud (either to no one or to someone nearby)
Repeat it with action … point, touch, move or just handle the thing or object related to what you want to remember
Repeat it by writing … write it down and note it

Then do the same things again and again … eventually over time, these things will get ingrained in your thoughts and actions.

Some processes take time to remember (like playing an instrument) but others take less time (like where are my damned keys!)