How do I add a network to MetaMask chain?

Hello there! I'm interested in expanding the reach of my MetaMask wallet by adding a new network to the chain. Could you please guide me through the process step-by-step? I'm fairly new to this, so a detailed explanation would be highly appreciated. Is there a specific set of requirements I need to fulfill before I can add a new network? Also, are there any potential risks or considerations I should keep in mind while doing so? Thanks in advance for your help!