The Rules
Basketball is a team sport.

Two teams of five players each try to score by shooting a ball through a hoop elevated 10 feet above the ground.

The game is played on a rectangular floor called the court, and there is a hoop at each end.

The court is divided into two main sections by the mid-court line.

If the offensive team puts the ball into play behind the mid-court line, it has ten seconds to get the ball over the mid-court line.

If it doesn't, then the defense gets the ball.

Once the offensive team gets the ball over the mid-court line, it can no longer have possession of the ball in the area behind the mid-court line.

If it does, the defense is awarded the ball.

The ball is moved down the court toward the basket by passing or dribbling. The team with the ball is called the offense. The team without the ball is called the defense.

The defense tries to steal the ball, contest shots, deflect passes, and garner rebounds.

Game Clock
Each game is divided into sections, and all levels have two halves.

In college, each half is twenty minutes long.
Points
When a team makes a basket, they score two points and the ball goes to the other team.

If a basket, or field goal, is made outside of the three-point arc, then that basket is worth three points. A free throw is worth one point.

Free throws are awarded to a team according to some formats involving the number of fouls committed in a half and/or the type of foul committed.

Fouling a shooter always results in two or three free throws being awarded the shooter, depending upon where he was when he shot. If he was beyond the three-point line, then he gets three shots.

Other types of fouls do not result in free throws being awarded until a certain number have accumulated during a half (called “team fouls”).

Once that number is reached, then the player who was fouled is awarded a '1-and-1' opportunity. If he makes his first free throw, he gets to attempt a second. If he misses the first shot, the ball is live on the rebound.

Fouls and Violations
In addition to stealing the ball from an opposing player, there are other ways for a team to get the ball.

One such way is if the other team commits a foul or violation.

FOULS

Personal fouls: Personal fouls include any type of illegal physical contact.

Hitting
Pushing
Slapping
Holding
Illegal pick/screen -- when an offensive player is moving. When an offensive player sticks out a limb and makes physical contact with a defender in an attempt to block the path of the defender.
Personal foul penalties: If a player is shooting while a being fouled, then he gets two free throws if his shot doesn't go in, but only one free throw if his shot does go in.

Three free throws are awarded if the player is fouled while shooting for a three-point goal and they miss their shot. If a player is fouled while shooting a three-point shot and makes it anyway, he is awarded one free throw. Thus, he could score four points on the play.

Inbounds. If fouled while not shooting, the ball is given to the team the foul was committed upon. They get the ball at the nearest side or baseline, out of bounds, and have 5 seconds to pass the ball onto the court.

One & one. If the team committing the foul has seven or more fouls in the game, then the player who was fouled is awarded one free throw. If he makes his first shot, then he is awarded another free throw.

Ten or more fouls. If the team committing the foul has ten or more fouls, then the fouled player receives two free throws.

Charging. An offensive foul that is committed when a player pushes or runs over a defensive player. The ball is given to the team that the foul was committed upon.

Blocking. Blocking is illegal personal contact resulting from a defender not establishing position in time to prevent an opponent's drive to the basket.

Flagrant foul. Violent contact with an opponent. This includes hitting, kicking, and punching. This type of foul results in free throws plus the offense retaining possession of the ball after the free throws.

Intentional foul. When a player makes physical contact with another player with no reasonable effort to steal the ball. It is a judgment call for the officials.

Technical foul. Technical foul. A player or a coach can commit this type of foul. It does not involve player contact or the ball but is instead about the 'manners' of the game. Foul language, obscenity, obscene gestures, and even arguing can be considered a technical foul, as can technical details regarding filling in the scorebook improperly or dunking during warm-ups.

VIOLATIONS

Walking/Traveling. Taking more than 'a step and a half' without dribbling the ball is traveling. Moving your pivot foot once you've stopped dribbling is traveling.

Carrying/palming. When a player dribbles the ball with his hand too far to the side of or, sometimes, even under the ball.

Double Dribble. Dribbling the ball with both hands on the ball at the same time or picking up the dribble and then dribbling again is a double dribble.

Held ball. Occasionally, two or more opposing players will gain possession of the ball at the same time. In order to avoid a prolonged and/or violent tussle, the referee stops the action and awards the ball to one team or the other on a rotating basis.

Goaltending. If a defensive player interferes with a shot while it's on the way down toward the basket, while it's on the way up toward the basket after having touched the backboard, or while it's in the cylinder above the rim, it's goaltending and the shot counts. If committed by an offensive player, it's a violation and the ball is awarded to the opposing team for a throw-in.

Backcourt violation. Once the offense has brought the ball across the mid-court line, they cannot go back across the line during possession. If they do, the ball is awarded to the other team to pass inbounds.

Time restrictions. A player passing the ball inbounds has five seconds to pass the ball. If he does not, then the ball is awarded to the other team. Other time restrictions include the rule that a player cannot have the ball for more than five seconds when being closely guarded and, in some states and levels, shot-clock restrictions requiring a team to attempt a shot within a given time frame.

Basketball Positions and Roles
1. Centre
The centre is usually the team’s tallest and strongest player and is positioned under the basket. He is also required to be physically domineering with more physical strength and athleticism.

On the offensive play, most centres do not consistently score midrange or beyond the arch. Instead, most of their points should be from offensive rebounds and are also required to block defenders to open other players up for driving to the basket.

On the defence, the centre is responsible for keeping the opponent from shooting by blocking shots and passes in the vital area. They’re also expected to fight for rebounds as they’re usually taller physically.

2. Power Forward
Power Forwards are usually the second tallest in the team and are the closest to the centre in terms of physical attributes and playing style but with more speed.

They are often the most versatile player, being able to score in the paint as well as being able to shoot from midrange. It will be more effective if they’re able to land a three-point consistently.

Defensively, they are required to have the strength to guard bigger players close to the basket.

3. Small Forward
The Small Forward is usually the shorter of the two forwards on the team but plays the most versatile role out of the main five positions.

He must have enough height and the ability to play on the inside as well as agility to play on the outside, similar to a shooting guard. Small Forwards are usually the second or third best shooters on the team and should be able to do a little bit of everything on the court.

4. Shooting Guard
Potentially the shortest player on the team, the Shooting Guard is the team’s best outside shooter. Besides being able to shoot well, the Shooting Guard needs to be good at dribbling fast, passing and having court vision by seeing the court.

He is also responsible for driving the ball down the court and setting up offensive plays.

A good Shooting Guard will be a threat to his opponent as he’s able to score from anywhere on the court.

5. Point Guard
The Point Guard is usually the shortest but the best ball handler on the team. Also known as the ‘coach on the floor’ or the ‘floor general’, a point guard is responsible for directing plays.

He needs to have good court vision to create open shots for the receivers as well as drive the ball down the court and initiate offensive plays.

Point Guards need to have an excellent long-distance shooting, though it’s not quite as crucial as for shooting guards, some point guards take as many shots as shooting guards.