Can someone explain the exact differences between the three?
I'm most familiar with the fork, where the rules of generating blocks change creating a fork where miners can choose to follow the old rules or the new rules.
An airdrop is simply taking the balances of an existing blockchain to distribute a token on a new independent blockchain.
What is the spoon? I've read some introductions to it and it sounds like a sort of hybrid but I don't quite get it. An ELI5 approach would be greatly appreciated!