Others think that L2's "data availability / ordering / finality" are mystical high-level terms, and if you don't understand, you can only kneel and believe. The actual core is: can what you send out be seen by everyone (don't hide); who queues up, don't cut in line (don't cheat); and ultimately, can it truly be final and authoritative (don't back out). To put it simply, when you see the team start making promises and boasting about "instant finality," ask first: where is the data stored, who is in line, and who takes the blame if something goes wrong. By the way, hardware wallets are out of stock lately, and phishing links are everywhere... Security awareness shouldn't stop at forwarding warnings; clicking links carelessly is more dangerous than studying technical terms.