Before agriculture we obtained food in the paleolithic age by hunting and gathering. Some of the problems with obtaining food this way was that it was not always reliable. If you stayed in an area to long the natural fruits and nuts would be overtaxed and animals would not stay in one place for too long.I wish that we could stay in one place and have a stable source of food.
Now we have developed agriculture. One of its affects was the creation of domesticating animals. We learned that if we kept and bred animals that we could eventually get meat and milk from them which gave us a stable food source
With agriculture we learned that we could plant seeds and harvest fruits and vegetable once they grew. This gave us another stable source of food.
Our invention agriculture is growing crops from seeds that you planted then harvesting them as a food source.
Our invention of agriculture was important because it allowed us to stay in one place and have a sustainable food source.