In general, we acquire bitcoins from trading platform, and we can store them directly in the address that established by the platform. Such method can guarantee your trading at any time, and you don’t have to worry about the loss of private key, because it is not saved by yourself. However, you must trust the safety of the platform. Historically, MT.GOX and coincheck have been attacked by hacker, which caused the loss of users’ funds.
Nevertheless, if you have a lot of btc but trade rarely, you can choose the bitcoin core, which is like the management tool of private key, address and blockchain data, including PC wallet, mobile wallet, online wallet and cold wallet. The advantage of these kinds of wallet is convenient to operate, but you have to remember your account number and password. If you forget it, you lose your right to operate the bitcoin in wallet.
Besides, another safer method is store bitcoin by multisig and paper wallet, which means to record your address and private key on a paper, then a QR code will be created and printed by a specialized website. It can prevent your wallet from being attacked by computer virus, also prevent your computer hard drive from being damaged.
Of course, if your hardware and technique permit, you can choose full node wallet. By loading bitcoin client, the complete blockchain data is downloaded, which can guarantee the safety of bitcoin network and strengthen the degree of decentralization. As the bitcoin value added, the option are also increasing, but you need to learn more about bitcoin wallet if you want to try the bitcoin trading.