Cultural appropriation is widely understood to be when someone in a position of power (most commonly a white person) utilizes something that is heavily related or socially seen as "part of" a minority community. For example, a white person wearing a Native American headdress. The issue that the minority community has with that is that they are routinely belittled or put down for participating in that part of their own community. For example, a white person wearing a Native American war bonnet to Coachella is appropriation, as war bonnets are culturally significant to Native Americans and you have to earn the ability to wear one. Meanwhile, many white Americans still put down Native American customs as "witchcraft".

When it comes to food, music, or clothing, you're pretty good there. It's primarily just avoiding things that are culturally or spiritually significant to a culture. I.E., don't wear a headdress if you're not Native American, don't act like you're the best rapper ever if you grew up on a farm in Kansas, or say you make the best gumbo in the world if you've never even been to New Orleans.