Not jumping in with both feet and buying everything you see. It’s easy to get overwhelmed with the choices . Stacking isn’t a race it’s a way of life. Slow steady and having a plan is the biggest part of stacking. Collecting is a little different. Pick one or two coins that you really like and want to collect. Then read as much information as you can on them. I’d even suggest buying a graded one to compare it to raw coins.