Skateboards can be bought pre-assembled, or you can buy all of the pieces and put it together yourself. Pre-assembled boards are best for beginners, until you decide if skateboarding is really for you. If you are putting your own board together, you'll need a deck (the board itself), grip tape for the top of the deck so your feet don't slip, 2 trucks (the metal parts that are the axles of the wheels), 4 wheels, and 2 bearings per wheel (these keep the wheels spinning on the truck's axle). Before each time you ride, make sure your trucks are tightened and your wheels are spinning properly. Don't forget to wear a helmet, knee and elbow pads, and wrist guards. It's important that your helmet is approved by one of the groups who test helmets to see which ones are the best: the Snell B-95 standard is best for skateboarding helmets. Non-slippery shoes are a good idea too, so you can have better control of your board.
Before you ride, make sure you give your board a safety check to make sure everything is put together right. Always wear all of your protective gear including a helmet, knee and elbow pads, and wrist guards. If you do tricks with your board, you may also want to wear gloves to protect your hands from the pavement. If you're just starting out, skate on a smooth, flat surface so you can practice keeping control of your board. And no matter how experienced you are — never hold on to the back of a moving vehicle! It's best to skate out of the way of traffic and other people (skate parks are great places to skate). But if you are skating in streets near your house, be aware of cars and people around you, and stay out of their way. Also, once the sun sets, it's a good idea to put up your board for the night, since skating in the dark can be dangerous.