Africa is just resources and that's it, the people are untrained there.
You are not far from the truth; Africa has been a raw material bank for developed nations. Developing nations have refused to assist build industries in Africa to create jobs and train human resources. Rather they prefer to site industries in their home country and sell the finished products in Africa. Bad governance has also contributed to the underdevelopment of Africa. Bribery, corruption and embezzlement are popular in the continent.
But things are changing. African nationals have started developing themselves and are doing well in different fields. Illiteracy might be high in the continent but more people are becoming skillful and educated in different profession.