I think there are a couple of helpful posts in the NFT channel, but let me answer what I can based on your questions:
Drops - these are just what they call releases. Just like we would say the WonderCon releases are a drop on Funko.com, NFT pack releases are a drop on Droppp. I think this is kind of a card thing in general because people will also say things like "Topps flagship drops on this date".
Burning Packs - this usually refers to post sale for a pack release/drop. Funko does not keep sets on sale until they sell out, they end any sales that are not sold out after a few hours and then the remaining packs are burned. That just means they are destroyed/not allowed to be sold. If that happens, the odds change accordingly. So, if 50% of packs are burned, there are only 50% of the LE number for each Pop remaining. If it was a 2200 piece and 50% of packs are burned, there should be approximately 1100 left to be found.
Coins - the coin now is just a fun little bonus you can get in a pack but they used to have a different purpose. In the system they used before Droppp, they had to include an extra item in each pack so that they could include the 1 of 1s. That changed once they moved to Droppp and the system could handle just randomly having an extra item in various packs and so the coin became something that you can find in packs every now and again like any other card.
Wallet - this is the most confusing of them. Basically, you hold your crypto in your wallet. But you can have multiple wallets. I have a Droppp wallet and that stores USDC (the crypto currency that Droppp uses) but any of us who have been buying Funko NFTs from the beginning have at least one other wallet that stored our waxp (which was the currency we used to buy and sell before USDC, and which you can still use on places like Atomic Hub but not on Droppp. Told you it was confusing
) The amount you have varies based on the market. At one point, waxp was worth about 90¢ each and it's about 4¢ now. USDC is based on the actual US dollar. The difference in between places like Atomic Hub and Droppp, other than the currency you have to use, is that Droppp has a floor price of 5¢ for any NFT and Atomic Hub does not so you can actually get commons, uncommons, and rares a lot cheaper on AH usually.
For me, buying packs is a rush but like any cards you might buy, you have a chance of striking out completely. If you only want one or two Pops from a drop, it is definitely cheaper to buy them outright. You can buy USDC on any of the crypto exchanges. I would not be a lot of help here, I haven't gotten crypto in a while from any of those places but I used to use Bittrex until that closed down.
. I don’t understand most of the terminology, drops, burning packs, coins, wallet, etc. I usually just lurk and wait until people post their redemptions for sale, but I want to learn how all this stuff actually works . I know some people think buying packs is a waste of money when it’s only 1 or 2 pieces you’re actually after (for example that Freddy as Sid is SICK), but idk I kind of like that rush. It’s like opening a Wonka Bar and hoping for a golden ticket XD. 
