Data availability, ordering, finality—these words sound pretty intimidating, but everyone understands one main idea: whether the "result" you see can actually be changed by others or verified. Basically, the data must be accessible to everyone (otherwise, you can only listen to others' stories), transactions need a rule for queuing (otherwise, you might think you're first, but someone cut in line), and finally, whether it's "really finalized" (otherwise, a rollback can leave you stunned).

My own obsessive-compulsive approach is pretty simple: after interactions, revoke permissions; split operations into separate wallets; try with small amounts first; then check if there are strange addresses doing weird things on the chain... Recently, someone was complaining that on-chain data tools/tag systems are lagging or even misleading, so I no longer blindly trust tags. I prefer to look at the raw transaction records a few more times. Anyway, less "I think" and more "I confirm" makes me sleep better.