http://www.mesopotamia.co.uk/writing/home_set.html - The British Museum discusses the history of writing in ancient Mesopotamia, its various forms, tax systems, and more.
https://www.ancient.eu/Egyptian_Hieroglyphs/ - This article is from the Ancient History Encyclopedia. It offers an exploration of the hieroglyphic writing systems of Ancient Egypt.
https://www.youtube.com/watch?v=sohXPx_XZ6Y – A Crash Course video summarizing Mesopotamia and other ancient civilizations of the Fertile Crescent.
https://www.youtube.com/watch?v=lotbZQ55SgU –Veritasium covers the troubles and scientific mystery of building the pyramids at Giza.