My little garage built in early 1940's is leaning a little on one side
+4
It's wood,no insulation or anything.
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1940's, wood, leaning. It may be on it's last leg. You either need a carpenter contractor or garage company to determine if it's still structurally sound for repair or needs to be replaced.
William gave the perfect answer.
Do you want to fix yourself? If you need to hire a contractor, here is how.
https://www.consumer.ftc.gov/articles/0242-hiring-contractor
Its a structural issue, and possibly a foundation issue, get a contractor to look at it.