Can I add funds directly to MetaMask?

I'm curious about the process of funding my MetaMask wallet. Could you elaborate on whether it's possible to add funds directly to MetaMask, and if so, how does one accomplish this? Is there a specific process or set of steps I need to follow? Are there any fees or limitations associated with adding funds directly to MetaMask? Additionally, are there alternative methods of funding the wallet that may be more convenient or cost-effective? I'm interested in understanding the full range of options available to me.