Big card collector when I was a kid. Mainly NHL cards. Complete sets from 73 through early 80's, Topps and O-Pee-Chee. Did a lot of that buying a couple packs at a time. Also collected MLB and NFL but not as much as the hockey cards. My favorites are Gretzky rookie card and a autographed 1976 Nolan Ryan card.
I also used to mail cards to teams and asked for autographs. Almost every team would send me the autographed card back along with other stuff like autographed photos, schedules, team photos, etc. It was a fun hobby when I was a kid.