What type of writing did people first used?

Answer 1

Sumerian cuneiform has been found and radiocarbon dated to 3500-3200 BCE.

This civilization, Sumer existed more or less where Iraq is now, and used to be called Mesopotamia. The writing is ideogramic. In 1998, people discovered what (appears to be) Indus Valley Civilization (IVC) script radiocarbon dated to 5500 BCE in South India and Sri Lanka. No one has ever successfully translated IVC script, nor accepted it to be writing, as opposed to proto-writing. Interestingly, IVC script has also been found in Mesopotamia. In 2008, people discovered carvings on tortoise shells radiocarbon dated to 8600-6600 BCE in Jiahu, China. The inscriptions resemble letters used during the Shang dynasty, but it is unlikely that these inscriptions will ever be considered as other than proto-writing. Interestingly, bone flutes were also found at the same site, which one can play Shang dynasty-era music with. So, to summarize, the current academic consensus is that Sumerian cuneiform is the oldest writing that has ever been found, but this could change. It might also be worth noting that Sumerian is a "language isolate", whereas, to quote Wikipedia: "Indic scripts are used by languages of several linguistic families.

Answer 2

The first kind of "Writing" was cave paintings that prehistoric cave dwellers drew on the cave walls, but the first "Writing" was called "Pictogram's" made by the ancient Egyptians on reed or clay tablets. It was basically writing with pictures. That's all I know. Follow the link for more info.