Today, there are different ways one can become a knight.
People can become knights because a sovereign who is able to knight someone wishes to reward them for some meritorious public service. Sir Alec Guiness and Sir Elton John are examples of people who received the knighthood in this way. Some European kings and the Pope grant knighthoods.
A person can be elevated to knighthood by an independent order of chivalry, such as the Order of the Knights of Malta, and this is also normally done for public service. The Knights of Malta is one of four continuation of the Knights Hospitaller that are closely related to each other
There are a number of orders of knighthood, such as the Knights of Columbus, which have no background in chivalry, but are nonetheless worthwhile organizations. These are usually fraternal organizations. People in these organizations can be called knights, but it is not quite the same thing as being granted a title by monarch or historical order of chivalry.
There are a number of self-styled orders of knights, some of which have been based on fraudulent claims of one sort or another. To join such an organization, you pay money. The legitimacy of the title you get is no greater than if you simply give yourself a title.
There is a link below to an article on Self-styled Orders, and another to the the Fount of Honor, which relates to the foundations of legitimate orders of chivalry.
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A medieval knight in the middle ages or medieval times was William the conquerer
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There were no realy "teachers" in the medieval times. If you wanted to become a knight you were trained by a knight or if you wanted to be a scholar you would be traineed by a scholar.
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They wear suits of armor.
A boy started training to become a knight at age of 7-14 and became a Page 14-21. After that he became a Squire which is an apprentice to a Knight. Eventually the Squire might be dubbed a knight by a King or the Knight who trained him after praying and standing vigil for an extended period.
in medieval times a 'squire' was a knight's assistant.
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A squire in medieval times served as a knight's assistant, helping with tasks such as caring for the knight's armor and weapons, tending to their horse, and accompanying them into battle.