Recently, I keep seeing everyone talk about data availability, ordering, finality—so many terms that scare people away... Actually, just focus on one main thread: the transaction you send, can it be "seen by everyone, ordered by whose sequence into the block, and ultimately can it be reversed." To put it simply, first ask whether there's a place to store the data and whether it can hold (otherwise, decentralization on the chain is useless), then look at who controls the ordering rights (sometimes it's just deciding whether you'll be front-run or stuck for a long time), and finally, it's about finality—the moment you dare to treat it as true settlement. Recently, before and after the upgrade of mainstream public chains, people are guessing whether projects will migrate; I actually want to see if they've solved any one of these three issues, rather than just changing the chain name and calling it rebirth. (I tend to get serious whenever I see the words "finality.")