Shows your latency: A measure for figuring out how laggy your connection is.
Shows how laggy the server itself is. The closer to 20, the better. The command shows TPS at 1m, 5m and 15m so you get a good idea of server performance the last 15 minutes.
Shows when a player was last online
How rich are you? Or poor 😉
Creates a home warp point, default players get 1 sethome, vips get more. You get back to that point with /home