To buy CBT, simply click the "Buy Tokens" button and enter the amount of Ether you want to convert to CBT, based on the current Buy Price. When confirming the transaction on MetaMask, be sure to use a high enough gas price so that the price doesn't change drastically while the transaction is in progress. . Buying coins will increase both the Buy Price and Sell Price with 0.00000001 ETH per bought coin once the transaction is complete.
Decentralized applications (dApps) are digital applications or programs that reside and execute on a blockchain or peer-to-peer network of computers rather than a single computer and are independent of any single authority's control. At Cryptoknowmics, you will get all the information you need to know about Dapps and their use cases.