I created a African Art hub page to explain what you should look at to build a collection with genuine African Art. When I read the messages posted on the many discussion groups on the internet I see that most African Art collectors still strugle with the fact that they don't know how to recognise if a piece is AUTHENTIC or not.
I must tell you that even if I grew up with African Art myself, it is not an easy task and that even today, I have somethimes to live a few days with a piece of African Art before beeing able to put it in the category "genuine" or "fake".
And even then sometimes the answer is not 100% on one side or the other.
You must get experienced and see as many genuine pieces as possible.
I explain some of the resources to explore at the African Art hub