The best way to purchase and store cryptocurrency is to find a reputable exchange that offers the type of cryptocurrency you are interested in and use a secure wallet to store it. Make sure you research any exchange or wallet before using it to ensure it is secure and has a good reputation. Once you have chosen your exchange, be sure to transfer any cryptocurrency you buy into a secure wallet as soon as possible. When storing your cryptocurrency, make sure it is backed up in multiple locations in case one storage location is compromised. Finally, never store large amounts of cryptocurrency in any online exchange or wallet, as this can lead to losses if the service is hacked.