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?
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My understanding is that the dominate theory is that there was no one singular first language. Language is older than modern homosapiens. Or it is thought so, that other species of the genus homo also had language. We actually have no hard data on this subject, that would be quite impossible without a Time Machine.
We do not think language was “created” not like tools. It appears to be something we do instinctively as a species. It arises naturally through our interactions with each other. The first sounds humans made to indicate meaning would probably have been clicking sounds, or high pitched song like sounds. As those can carry a long distance. And they probably were first used to indicate danger or food. As hunter-gatherers would be spread out across a local area, and those are the most important things to communicate in that situation. And probably the first “rules” would be that a sound indicating danger from above would be different from a sound indicating danger from below. Or that food sounds would be different from danger sounds. Or even that mating sounds would be distinct from both.
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