You can buy the POLKADOT from Swapzone, one of the best non-custodial cryptocurrency exchanges. Also, you can purchase DOT from any of the numerous centralized cryptocurrency exchanges on the market, as there is no shortage of crypto exchanges that list DOT on their exchange charts. To buy DOT is simple, all you need is an internet-connected laptop or mobile device, to register an account on a cryptocurrency exchange or open a wallet that can send and withdraw DOT.