Kip Ashlynn on Nostr: From a user perspective, what actually keeps our identity secure? I've recently been ...

From a user perspective, what actually keeps our identity secure? I've recently been given a lot of information which conflicts with my previous understanding on how secure signers are and that's why I should just use Google login. But I don't want to do that at all and am just not going to be trying out new Nostr apps at all until I better understand this part.