How should I select a tennis racket if I'm completely new to the sport?
If you're a beginner tennis player, you should pick a racket that will help you learn the game quickly. There are a few key factors to consider. The first factor is grip size. There are several ways to measure grip size, but the simplest is to hold the grip and ensure there is about a finger's width remaining between your ring finger and base of your thumb when you hold the racket. Too small a grip may lead to squeezing the racket too hard, and too large a grip will make the racket unwieldy. The second factor is the weight of the racket. A racket in the range of 250 to 310 grams (unstrung) will be suitable for most players. A beginner male player might shoot for something in the 280-305 gram range, and a beginner female might use a racket in the 275-300 gram range. Junior players (age 10+), depending on age and size, should consider rackets in the 250 to 300 gram range. The third factor is the racket head size. You should look for a 100-105 square inch head size. These days even professionals use 100 sq inch commonly, and 95 is considered small (for advanced players). The racket composition is not a key differentiator, as most rackets are made of some sort of graphite composite material. Price is also not an indication of quality. Pricier rackets might be less suited to beginners, in fact. As to brand, it's a very personal choice. I would say choose a brand that you associate with wanting to play (perhaps you're a fan of a player who is sponsored by that brand). You can certainly find rackets at many big box retailers that would check all these boxes. And if you're not sure -- many online as well as local racket retailers run "demo" programs allowing you to try different rackets. Choose one that helps you consistently make contact with the ball and get it over the net. The most important thing is to get out on the court and play!
Instruction: How should I select a tennis racket if I'm completely new to the sport?
Context: 
Response: If you're a beginner tennis player, you should pick a racket that will help you learn the game quickly. There are a few key factors to consider. The first factor is grip size. There are several ways to measure grip size, but the simplest is to hold the grip and ensure there is about a finger's width remaining between your ring finger and base of your thumb when you hold the racket. Too small a grip may lead to squeezing the racket too hard, and too large a grip will make the racket unwieldy. The second factor is the weight of the racket. A racket in the range of 250 to 310 grams (unstrung) will be suitable for most players. A beginner male player might shoot for something in the 280-305 gram range, and a beginner female might use a racket in the 275-300 gram range. Junior players (age 10+), depending on age and size, should consider rackets in the 250 to 300 gram range. The third factor is the racket head size. You should look for a 100-105 square inch head size. These days even professionals use 100 sq inch commonly, and 95 is considered small (for advanced players). The racket composition is not a key differentiator, as most rackets are made of some sort of graphite composite material. Price is also not an indication of quality. Pricier rackets might be less suited to beginners, in fact. As to brand, it's a very personal choice. I would say choose a brand that you associate with wanting to play (perhaps you're a fan of a player who is sponsored by that brand). You can certainly find rackets at many big box retailers that would check all these boxes. And if you're not sure -- many online as well as local racket retailers run "demo" programs allowing you to try different rackets. Choose one that helps you consistently make contact with the ball and get it over the net. The most important thing is to get out on the court and play!