USED TO/WOULD FOR PAST HABITS

If you still get confused whether to use 'used to' or 'would' to talk about past habits, here's a useful video to learn the usage of  both forms with reference to the past.

I also recommend that you do some of the following activities. They'll take you some minutes but they'll help you consolidate this grammar point.
USED TO or WOULD 1
USED TO or WOULD 2