I read a sentence:
“Experience taught me how invaluable it is to reflect on and write down my decision-making criteria whenever I made a decision, so I got in the habit of doing that. ”
I barely interpreted 'get in' as 'develop or cultivate'.
I am not sure which meaning it takes from dictionary.
in Cambridge Dictionary: get in
to succeed in entering a place, especially by using force or a trick
In Oxford Dictionary get in
1.(of a train, aircraft, or other transport) arrive at its destination.
2(of a political party or candidate) be elected.