When it comes to tennis balls, adults play with the yellow pressurised balls you may have seen at Wimbledon and other big tennis tournaments.
However, here's a Top Tip from the LTA. For any beginner, use different coloured tennis balls which are slower, softer and lighter and therefore easier to hit – so you can have longer rallies and learn the sport. They come in red, orange or green (think traffic lights but with red the easiest to hit) and even some of the top pros use them when working on something new or coming back from injury.