I think when you get interested in antiques, the most frustrating thing is that books don't have enough photos. When you go to a flea market or garage sale, you see lots of things you've never seen before and you have no idea what the price is going to be or should be.
I started buying bits of broken porcelain. I furnished our first flat with pieces of 'junk.' Some of that 'junk' is now worth an awful lot of money. What I was calling 'junk' in the '60s people wouldn't call 'junk' now.