Just like most things in life, the answer depends on the required level of coverage, depth, time span, accuracy, and detail. And finally, the intended use. Can you clarify, please? Is this for a homework assignment?

What would you like to know?

I lost most of my bookmarks, but I find this website very useful:

https://www.indonesianhistory.info/

It has a lot of detailed maps of Indonesia throughout history.