What are the best practices for securing a Linux server that hosts a gaming website?

I'm looking for advice on securing a Linux server that hosts a gaming website focused on Nintendo-related content.

I'm interested in learning the best practices for:

Improving overall server security
Configuring the firewall and SSH securely
Protecting against brute-force attacks
Keeping the server updated with minimal downtime
Monitoring logs and detecting suspicious activity
Any recommended Red Hat tools or security features for system hardening

I'm still improving my Linux administration skills, so I'd really appreciate any recommendations, documentation, or real-world experiences from the community.

https://tomodachiliferom.com/