Is it normal to fight in a relationship?

Yes. Disagreements are normal and can even help couples understand each other. What matters is how you fight: no name-calling, no threats, taking breaks when angry and making up afterwards. Frequent fear or humiliation in fights is not normal and deserves help.

It depends on trust and comfort. Sharing can be practical, but nobody should be pressured. Agree on what is shared, such as streaming accounts or emergency access, and what stays private. Having privacy does not mean having secrets.