The value of digital money is huge. So You should not let anyone know your wallet password and wallet file. You have to be careful with phishing sites.
No wants to give away their personal details to others but scammers are very smart to steal things from common people.
If you can afford to buy hardware wallets then it will be the best option to protect you but if you can't afford then on the PC where you usually login into any of the online wallet don't download unnecessary things on that PC and use good anti-virus software to protect your PC from unknown viruses.