1. Use a hardware wallet. If you can't afford one, make sure your PC is clean and use an open source desktop wallet (e.g Electrum) that give you control over your private keys.
2. Don't store your funds in exchange for a long period of time. Deposit, trade instantly and withdraw.
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First, you need to use a strong password to secure your bitcoin wallet.You may use combination of letters and numbers.Secondly, make sure no body knows your account.Do not give it to someone else.