I am completely amateur about motors. I just want to start a road trip with a motorbike in Africa. I want to know which motor you professional recommended for this kind of trip. not very expensive, easy to maintain.
You are a novice when it comes to motorbikes but yet want to roadtrip through Africa on one? Not something i'd recommend, but fair enough: that was not your question.
For a roadtrip like that you need a reliable offroad-capable touring bike that has enough space for luggage. Good examples of those are the Honda Africa Twin and the BMW F800GS. Those bikes are used by adventurers all over the world.