If you are concerned about your security, either get a dedicated offline computer only for crypto storage. You will need to learn how to create raw transactions, move them to your offline machine, sign them, move them to your online pc and broadcast them.Trading platforms are not safer to store our coins but many exchanges offering some security to their wallets like 2FA,which can save the hack attacks but can't from exchanges hack attack that is why better to move your funds after trade completed.