Remember to use the password of the BTC wallet only there. Don’t utilize the same key in social networks, in e-mail and also don’t write it in notes on your phone. Two-Factor authentication can help you.

Cold wallets are a more secure, long-term residence for your Bitcoin. They’re also called ‘hardware wallets’ because they often come in the form of a USB-drive-shaped device that can plug into your computer or link to your computer or phone via Bluetooth technology. Hot wallets, however, generally live online, which makes them more vulnerable to hackers.

when I heard the word "hacked" I was very worried about my internet security system and checked it right away, hope it doesn't happen to me. although no system is safe, one must still be careful. especially regarding digital wallets which are currently very vulnerable to being hacked, sometimes we feel safe, but in fact, we are not.

Just don't hodl your money in an exchange or something that you don't handle the security of your private key.
There is no perfect security as everything in digital is made by someone else's code and it is just a matter of exploit of that code that can lead to potential hack and of course, the loss of your BTCs.

PS: OP just seems to promote his/er site to get clicks/visits judging from the post history. I didn't click the link anyway.

Don't be overconfident. There are various ways in which a software wallet can get hacked, and that's true for non-custodial and open-source wallets as well.

The most common way to lose your funds is downloading and installing a fake wallet. Electrum, for example, is a frequent target of various attacks and scams. You have surely heard about the notifications that were shared by malicious Electrum servers in the past that requested users to download newer versions of the Electrum client. In reality, they downloaded a fake phishing app infected with malware.

Other ways involve getting infected with a clipboard hijacker that changes your address to that of the hacker. There are RATs, crypto-stealing malware, password stealers, or keyloggers. These were produced to find and copy sensitive information such as private keys, passwords, wallet files, etc.       

I just read the full article, and i think you should change the name to 'What's a bitcoin wallet?' You spend a lot of lines talking about what is a bitcoin wallet, and only some words talking about if it can be hacked.

Any bitcoin wallet can be hacked, and if you have the most secure wallet software then your windows can be hacked, and that way the attacker could take your coins. Even if you don't have that computer online, someone can physically access that computer and take the coins.

So, any software is vulnerable nowadays.

Lets be honest, only paper offline generated wallet cant be hacked. Thats the truth of life, any electronic device could be hacked in theory

I do think that for the people who are already holding Bitcoins right now they understand the whole struggle already. The thing is , bitcoin itself is very secure. What you have to worry about is your :
Mobile
Wallet
Use a trusted wallet!
You have to understand and make the right decision about the wallet and then you have to move forward and secure your mobile also. Personal errors are very common and can cause a havoc.
Do not click weird links that you know nothing about and have never heard of it. Do not go on sites which might seem dark, do not open 📖 weird mails and honestly there are a lot of things that you should not do but it all starts and ends with having a personal security with respect to your electronic devices. Therefore I do think it would be more of a valid lesson to not only read about the security of a bitcoin wallet. But rather also work on general security.

Web wallets should be used by a newbie just as a wallet temporarily which they'll send the funds from there to a better wallet if their plan is to hold it for a very long time.

There were a lot of series and news that exchanges have been hacked and many users have been badly affected by it because they trust those platforms as a web wallet.

And we also need to be careful using any wallet and make sure that you keep private keys offline or in a written form.