1. Learn how to use a knight to fork.

Knights are extremely effective at forking (attacking multiple pieces at the same time)

You should always look out for forks when Knights are on the board (either to use them against your opponent or to protect yourself from them)

2. Place your knight in the center of the board.

Knights are short range pieces and work best when placed in the center (since they control the most squares there) A knight placed in the corner or edge of the board can only attack two squares, where as a knight in the center can attack eight.

3. Put Your Knights on “Outpost” Squares 

An outpost square is a square that you put your pieces and your opponents cannot chase them off of. Knights in the center of the board are very strong, so your opponent should try to chase your knights away from the center of the board toward the edges.

If you can get your Knight on an outpost square in the center, however, then your opponent can’t chase away your Knight and has to deal with it your Knight controlling all of the center squares.

4. Move Your Knights Before Your Bishops 

In general, you want to move your knights before bishops. Why? Because knights are short-range pieces that take a couple of moves to get to a strong outpost square, while bishops are longer-range pieces and can be influential from their starting squares, they can typically get to a good square in one move. In other words, you know where the knight goes, but not where the bishop goes.

5. Know the Limitations Of Knights

If a knight is on a light square, its next move must be to a dark square (and if a knight is on a dark square, its next move must be to a light square). You can use this information to your advantage and completely cut off a knight. If a knight just moved to a light square, you can use a dark-squared bishop (or queen) to completely stop the knight from moving.

See an example of this below: