What is FPS? FPS deals with how often the server checks for game packets. The more often it checks, the faster it will go.
What is tickrate? During each tick, the server processes incoming user commands, runs a physical simulation step, checks the game rules, and updates all object states. After simulating a tick, the server decides if any client needs a world update and takes a snapshot of the current world state if necessary. A higher tickrate increases the simulation precision, making this process faster.
What are slots? The amount of player slots your server has dictates how many people can be connected to your server at one time.
What is the difference between a private and a public server? A private server means that the server is password-protected. This is good for personal servers, such as match or scrimmage servers. A public server is open to anyone who wishes to connect.