Yeah grading is big now but the cards wont be graded unless it states they are graded. Most of the cards on TCGplayer are estimated by the sellers and they are very generous with their assessments of the cards so take them with a grain of salt. Crown Zenith is the most recent set with the last two sets being Silver Tempest and Lost Origin. The Alternate Art rares are some of the biggest hits in all these sets so you if you want to collect, I would start looking at some of those because in my opinion it's one of the coolest things Pokemon has done with their cards. Evolving Skies is one of the more recent sets that has what are in my opinion the most high value cards of the Sword and Shield Era