Ask What security measures should I upgrade to protect member data?

[SuperAffiliateX]

I'm setting up a membership site and handling sensitive data. I'm learning about security basics. I'm using a simple password system now. I'm worried about data breaches. I'm reading about encryption and firewalls. I'm looking for expert advice. I want to protect my members' information. I'm considering upgrading my security tools. What security measures should I upgrade to protect member data?