Tevere looks like Orbit-Db, is it?
Same functionality, new code, more robust CRDT implementation.
ipfs pubsub it’s like socket.io?
It’s similar. Both use a pubsub pattern for bidirectional communication. Main difference: sockets.io relies on a server to coordinate communications. IPFS pubsub is serverless – the peers coordinate themselves without relying on a middleman.
If i want to store secret data, for example passwords or credit card numbers, as i understood today ipfs keystore can’t encrypt data, so do we have any solutions?
Content encryption is up to you. There are a number of tools and strategies out there. Eventually IPFS will support a variety of them, but for now you’ve got to do it yourself.
Can i protect site from pinning?
Not sure what you mean by this. One of the main points of using p2p techniques is that it allows peers to pin the content that they rely on or care about.