Knights were men (and sometimes women) who could fight as heavy cavalry. They were trained over a long period of apprenticeship. When they were knighted, they usually received a manorial estate so they could provide for the horses, armor, weapons, and assistants they would need. In return for this, they had to provide military support for the king who knighted them. Their title made them a member of the nobility, of greater consequence than most other people, and their estates made them wealthy.
The three stages of knight hood were a page then a squire then finally you were a knight.
sir walter smith
to protect the king and castle
it was bad to be a knight because you could die.
A squire would be below a knight and other lesser nobles.