Knights are generally thought of as chivalric warriors upon horses with swords drawn riding into battle, while in truth, knights started out as young men hired into service by rich nobles and warlords with needs to fill out their own personal armies. .
In the beginnings of the 8th century chaos and danger ran rampant through Western Europe. The people had minimal protection from conquering hordes. It became evident to the local lords that they were going to be needing protection. The lords began mulling over the idea of hiring younger local men to act as a defensive force. Local lords soon started paying young men to protect the people from conquering parties of the outside. The lords decided it would be much cheaper to pay younger men than paying someone older who is looking for more than the lords were willing to pay. Before long, the lords were awarding grants of land to young men for their services so they could generate an income and be able to purchase the proper equipment for war such as armor, horses, and weapons. This all lead to the start of the medieval knight era in Western Europe.
As the knights got older they started using the land grants they received as hereditary rights. By giving his oldest son the deed, there was a rise in the knight's standing as opposed to being just a soldier.
Training as a knight started at an early age. Most often a knight was trained by a relative or a lord. The lord or relative would train the young boy in weapons and riding a horse. While the young boy was training as a knight he was known as a "squire." He would assist a knight by preparing him for combat, getting his horse ready, helping him with his armor and getting his weaponry. When a squire completed his knight training a ceremony was held acknowledging his full fledged knighthood. The knight now will start serving his new lord for military service for at least 40 days a year, serving as a castle guard, a bodyguard, and participating in battle.