And a wonderful and exciting way to improve your understanding is to learn about how glass is made.
There are a fair few places you can go to watch glassmakers at work, if you tell us your rough location I'm sure we can point you in some interesting direction or other.
Once you've got hold of the idea of all the technical difficulties, you can make better judgements of the quality of a piece. :thup:
Besides, it's just absolutely gob-smackingly fascinating to watch. :smg: