Don't Be the Next Mt. Gox Use a Hardware Wallet
Once you have bought Bitcoin, it is important to store it safely. The best way to do this is by using a hardware wallet like the Trezor or Ledger Nano S. These devices allow you to store your Bitcoins offline in what is known as cold storage. Cold storage is the most secure way to store Bitcoin because it means that the private keys are not stored on an internet-connected device.
If you don't want to use a hardware wallet, you can also store your Bitcoins on an exchange like Coinbase or Kraken. However, this is less secure because exchanges are often targets for hackers. Another option is to store your Bitcoins in a paper wallet. This involves printing out the private keys and storing them offline in a safe place such as a fireproof safe or bank vault.