How do I add a base network to my MetaMask?

Hey there, could you please explain to me in a straightforward manner how I can go about adding a base network to my MetaMask wallet? I'm a bit new to this and I'm not sure where to start. Could you guide me through the process step-by-step, including any necessary settings or configurations I might need to make? I'd really appreciate it if you could make it as simple and easy to understand as possible. Thanks in advance!