It depends on where you go, and what you consider decent food. You should always try local dishes. Fast food restaurants in Africa are typically a joke, and only exist for social status. In Ghana and Nigeria, joloff rice with fried chicken is a must. You also want to try the starches that you eat with your hands and dip in soups. "Groundnut" (peanut) soup with chicken is just amazing. West Africans also really know how to do tilapia well. Okra soup is great. Honestly you can just ask for recommendations because pretty much everyone in Africa, except for french-speaking countries like Mali, speak English fluently