A market buy order is often unfavorable, but the fastest. This is when you immediately buy the tokens offered from someone else on the exchange. For beginners it is often logical to start with a market buy order. But with a little more patience and insight into the order book, it is cheaper to set up a limit buy order. This way you can buy cryptocurrency tokens for the best price. CoinMiningRigs guides you in these matters. When you first send Bitcoins to an exchange, it will take a while before they arrive. As a beginner you can panic a bit, but nothing really has disappeared. The Bitcoin blockchain just takes a while to process a transaction, it depends on how busy it is on the network (sometimes it takes minutes, sometimes an entire day). Some exchanges clearly show the progress, even though it may take a while before it becomes visible. From CoinMiningRigs you will get all the supports and suggestions regarding all these. Even after purchasing altcoins (an order), it can take a while before a transaction is visible in your balance sheet. This can have several causes, such as an incomplete purchase (then a wait is made for a new provider who wants to sell at that price), or for example an error on the website itself. It is almost never the case that your tokens have disappeared. Patience is sometimes necessary, the technology is still relatively new.