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Full disclosure up front: we build Ripdex, so we are biased

Yu-Gi-Oh Master Duel can be confusing for old fans

For individual cards and older booster packs and boxes, you will just have to gain a lot of experience and learn the nuances of real Pokemon products and then make educated purchases, ideally with a means of recourse if it turns out you were scammed (some kind of buyer protection program, etc)

Being able to draw 1 or 2 cards every turn is more than excellent

If you're in a food coma and need something to read while you slump on the couch, why not take a look at the most expensive MTG cards of all time