How do I add a network automatically to MetaMask?

Hey there, can you guide me through the process of adding a network automatically to MetaMask? I'm new to this and not sure where to start. I've heard it's a pretty straightforward process, but I'd appreciate it if you could walk me through the steps. I'm assuming I need to access the settings, but then what? How do I add the network details? Any tips or common mistakes I should avoid? Thanks in advance for your help!