Tennis

What is Tennis?
Tennis is a racket sport that is played either individually against a single opponent or between two teams of two players each. Each player uses a tennis racket strung with a cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. he object is to manoeuvre the ball in such a way that the opponent is not able to play a valid return. If a player is unable to return the ball successfully, the opponent scores a point.

What do I need to play Tennis?
A Racquet, tennis balls and the basic moves, Forehand, backhand and serve.
Forehand
Backhand
Serve
Basic moves are easy to learn and exercise with friends and family, but if you are looking to up your level, learn also to serve and hit top spins, you should consider tennis lessons with a coach.

Eras

In tennis there are 2 eras, the amateur era and the open era.

In the Amateur era, the sport was divided between amateurs, who played in the prestigious Grand Slams (now called the Australian Open, French Open, Wimbledon Championships, and U.S. Open) and other official tournaments, and professionals, who were limited to barnstorming tours and exhibition matches.Source: Britannica

The Open Era began in 1968 when Grand Slam tournaments agreed to open their events to allow professional players to compete with amateurs.Source: Wikipedia, open era

Tournaments While the four Grand Slams are the most popular tournaments, players also play at lowers one to gather points.

For men's
ITF Future Tour
ATP Challenger Tour
ATP Tour 250
ATP Tour 500
Currently, the ATP Tour 500 consists of 13 tournaments on several continents. This number may vary depending on the year, as the ATP may add new tournaments or remove existing tournaments from the series.
ATP World Tour Masters 1000
only nine Masters tournaments being played per season. Four of them are held in North America, four in Europe and one in Asia.
ATP Finals
At this last tournament the eight best tennis players of the season meet.
Davis Cup
Grand Slam
Australia Open
Wimbledon
Roland Garros/French Open
US Open

For women's
ITF Women’s World Tour
WTA Challenger Series
WTA Premier
In total the WTA holds twelve Premier Tournaments per year
WTA Premier 5
Only five tournaments of this kind are currently being held. Hence the name “Premier 5”.
WTA Premier Mandatory
The WTA Premier Mandatory Tournaments are limited to only four per season.
WTA Finals
At the end of each tennis season, the WTA invites the eight best players of the year to Shenzhen, where the tournament is held.
Fed Cup
Grand Slam
Australia Open
Wimbledon
Roland Garros/French Open
US Open

Useful links

International Tennis Federation | ITF
Women's and Men's Association websites.
WTA Official Home of the Women's Tennis Association
ATP Official Site of Men's Professional Tennis