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Some cards, usually Backgrounds themselves, refer to "commander creatures." Those don't refer to a Background enchantment that is a commander unless it is also a creature

destroy 1 other monster on the field

Beyond that, a good rule of thumb is that you should have a very good reason for adding an extra color to your deck: whether that's gaining access to a card that's particularly powerful, or shoring up a major weakness

You Can Always Keep Learning Understanding the rules is critical for making the most informed and effective choices in the YuGiOh universe and your most formidable opponents have such an understanding

boasts many, many different effect monsters, which boast a huge variety of abilities between them

the Pokmon TCG database is a good place to start for this, but you might also find help from a friendly collector, dealer or via a collectors' group on social media