People obtained food in this age by hunting and moving with the herds so they could catch more easily. Some problems this way are that they didn't have time for anything else that's why there was a lack of inventions, another problem would be that they were always moving and they couldn't catch a break.
We learned that we could grow our own food by collecting and planting the seeds of plants.
We learned that if we could domesticate animals we could not have to hunt because the animals are right there.
Agriculture is many things but one of them is Farming and the invention of Agriculture was important because it allowed people to do so much more than just hunt.
Agriculture made our lives so much more easier because we got time to do so many other things and invent new things!