Volleyball is a team sport in which two teams of six players are separated by a net. Each team tries to score points by grounding a ball on the other team's court under organized rules.[1] It has been a part of the official program of the Summer Olympic Games since Tokyo 1964. Beach volleyball was introduced to the program at the Atlanta 1996 Summer Olympics. The adapted version of volleyball at the Summer Paralympic Games is sitting volleyball.

https://en.wikipedia.org/wiki/Volleyball

noted the volleying nature of play and proposed the name of “volleyball.” The original rules were written by Morgan and printed in the first edition of the Official Handbook of the Athletic League of the Young Men’s Christian Associations of North America (1897). The game soon proved to have wide appeal for both sexes in schools, playgrounds, the armed forces, and other organizations in the United States, and it was subsequently introduced to other countries.

https://www.britannica.com/sports/volleyball

Only 6 players on the floor at any given time: 3 in the front row and 3 in the back row.

Points are made on every serve for the winning team of the rally (rally-point scoring).

Players may not hit the ball twice in succession (a block is not considered a hit).

Ball may be played off the net during a volley and on a serve.

A ball hitting a boundary line is in.

A ball is out if it hits an antennae, the floor completely outside the court, any of the net or cables outside the antennae, the referee stand or pole, or the ceiling above a non-playable area.

It is legal to contact the ball with any part of a player’s body.

It is illegal to catch, hold or throw the ball.

A player cannot block or attack a serve from on or inside the 10-foot line.

After the serve, front-line players may switch positions at the net.

Matches are made up of sets; the number depends on level of play.

https://www.theartofcoachingvolleyball.com/basic-volleyball-rules-and-terminology/

A tightly stretched net is placed across the court exactly above the middle of the center line; official net heights (measured from the top edge of the net to the playing surface—in the middle of the court) are 2.4 meters (8 feet) for men and 2.2 meters (7.4 feet) for women. Further adjustments in net height can be made for young people and others who need a lower net. A vertical tape marker is attached to the net directly above each side boundary line of the court, and, to help game officials judge whether served or volleyed balls are in or out of bounds, a flexible antenna extends 1 meter (3 feet) above the net along the outer edge of each vertical tape marker.

https://www.britannica.com/sports/volleyball/The-game

The setter is the main contributor to the offense of the volleyball team. One of the requirements of the setter is having a delicate touch to set the ball perfectly for one of the attacking players. Communication is extremely important for the setter because they need to get the rest of the players on the same page. Without the setter, there wouldn’t be hard spikes or technical ball movement.

Outside Hitter

The outside hitter is also known as the left-side hitter and is the lead attacker in the offensive strategy. To be a successful outsider hitter, you must be able to jump high, be quick on your feet, and be ready to adapt to different situations. The volleyball won’t always be placed where the outsider hitter would like, so they need to be prepared for hits from a variety of places.

Opposite Hitter

Also known as the right-side hitter, these players need to be a perfect balance of both offense and defense. They will also get many opportunities to hit the volleyball, so similar to the outside hitter, jumping ability is vital. The main difference that sets the opposite hitter apart is their defensive responsibility. Being able to receive the serve from the opposing team is just one of the many requirements of this specialized position.

Middle Blocker

The middle blocker, sometimes known as the middle hitter, is the tallest player on the volleyball team. Their main role for the team is being the first line of defense against the opposing team’s hits. The middle blocker needs to read the other team’s attackers to quickly raise his or her arms above the net in a blocking attempt. However, this is not a defense-only position. The middle blocker will have chances for quick points throughout the set.

Libero

The libero can become confusing for non-volleyball players. They can only play on the back row of the court, and because of this, are the ideal person to receive a hit from the opposite team. There are set rules the libero needs to follow, such as not attacking the ball at the net, playing a set for an attacker from the front, and more. You can always tell a libero apart from the rest of the team because they wear a different colored jersey.

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basics-volleyball-player-positions/