I know almost nothing of African history and to my knowledge, there is very little about Africa that was preserved because many African nations did not manage to advance to develop linguistics or primacy sources like letters or documents that made archeological/historical tracing possible.
But when I encounter this name, it is always the same that this person was the richest person ever lived.
So how accurate is this claim and if so, how were we able to interpret this with much accuracy given that African sources or sources about Africa are quite scarce?
This is a topic that has come up here already from time to time. There is always more to say, but it's almost certainly not true than Mansa Musa was indeed "the richest person who ever lived", and good reason to think his display of wealth was a long-planned and carefully orchestrated piece of political theatre.
You might like to review some earlier responses that fill you in on Musa and his wealth while you are waiting for fresh responses to your query. For instance:
How wealthy was the Malian emperor Mansa Musa? How did his display his wealth? with /u/mikedash
Was mansa musa really the richest person ever? with u/davepx
How was Mansa Musa I able to become so wealthy? with u/Commustar