How the very first languages of humans were created? How people all agreed to call something “water” for example?

Question

Basically the title. Languages often have complex rules and a lot of words. How everyone agreed on them? And together created the languages? What process did they go through?

In: Other

Answer 1

I gave my toddler water. She said “gua gua”. I said ” no, it’s water”. Now the whole family calls it “gua gua.”