The best altcoins are determined from several categories of DEX, CEX, NFT, Metaverse, and DEFI coins to find the best coin category, you can check on coinmarketcap and see the Top 100 where you can judge for yourself whether the coin you are looking for is worth it or not.
Well, that's actually the entire altcoins market. You name all of them and they can be found almost everywhere that you've mentioned. But there are also other coins that haven't been seen on top 100 but later, they've become known and popular as their demand increases.
always DYOR every time you start investing. Never investing without you know about that project
Correct. Don't do that unless you're willing to burn that money you're about to invest. It is unwise to invest to projects that you have no idea.