Reddit reviews A Taste of Africa: Traditional & Modern African Cooking

For an overview of major African regions, start with Wikipedia: https://en.wikipedia.org/wiki/African_cuisine . From there, head to individual regions or countries. Don't expect much in the way of recipes, but you'll find out what typical/famous dishes for various regions/countries are, and then you can look for recipes.

For a reasonable collection of recipes online, try http://www.kadiafricanrecipes.com/ (and some more at http://www.pbs.org/food/cuisine/african/ ).

For offline recipes:

• https://www.amazon.com/Taste-Africa-Traditional-African-Cooking/dp/1580084036/ - there are better cookbooks for individual regions/countries, but this provides a good compact overview of much of the continent.
  
  
• For pretty pictures as well as recipes, try https://www.amazon.com/Complete-Illustrated-Cooking-Africa-Middle/dp/1780194897/ - not exclusively African, but has enough African stuff to be useful.