What the hell are Zaps? Or what's the difference between Lightning tips and Zaps?

Simply put, Zaps are Nostr aware Lightning tips. They are integrated with Nostr in a way that allows the sats sent to be tallied and displayed on an individual user's note. Everyone can then see the value of that individual note. That is the key point.

If your Lightning wallet does not support Zaps, you can still send Lightning tips, they will just not be counted and displayed on Nostr. You can still send and receive sats! This is the whole point of Value for Value.

The only Lightning wallets that support Nostr integration (NIP-57) are the following:

strike.army

vida.page

stacker.news

bitcoin jungle

ln.tips (LightningTipBot)

Many others are working on adding support for this. This includes Wallet of Satoshi, BTCPay server, Bitcoin Beach, and probably many more.