I'm a newbie with some technical skills, but not a lot.
Should I be using MetaMask for added security?
What does MetaMask do for me, exactly?
Also, MetaMask seems to only work for Ethereum-based coins. Is there an extension like MetaMask available for the other coins?
Metamask are very good and safest ways to access your wallet on MEW (Erc20).
you can Install it from google chrome extensions.
because with that app , you can access your wallet without put your Private key.
so this is way can avoid us from phising or the other method of hacking
hardware wallet would be safer than metamask.