Install LAMP Stack on AlmaLinux, to ensure the server is secure?

Hi, I've been working on setting up a LAMP stack on AlmaLinux and found a comprehensive guide that walked me through the entire process. The guide covers all the steps, from installing Apache, MySQL, and PHP, to configuring them to work seamlessly together. You can check out the detailed installation here.

One thing I'm curious about is the most suitable methods for securing the LAMP stack post-installation. What additional steps or tools do you recommend to ensure the server is secure? Any advice would be much appreciated.