4. Can cryptocurrencies be subject to theft or hacks and how does one protect against them?
Yes, cryptocurrencies can be subject to theft and hacking, and there have been many cases of people losing their cryptocurrencies due to false exchanges, theft of private keys, or electronic fraud in virtual wallets used to pay with these currencies. Protecting cryptocurrencies involves a high degree of security and caution, including storing private keys in secure locations, investing in hardware wallets, and using secure online payment methods.
Here we need to add that cryptocurrencies also can be lost by the owner if he doesn't do a proper backup. There is a lot of Lost bitcoin because this motive.
but it is important to remember that transactions on the blockchain network are recorded and are completely public activities, so any attempt to use cryptocurrencies to Illicit transactions can be easily tracked and detected.
We can avoid begin tracked if we have a good coin-control an if we make transactions like Coin-join and STONEWALL, also we can use Mixers here.
7. How can I start investing in cryptocurrencies and what precautions should I take?
To start investing in cryptocurrencies, a process similar to any investment is required, including selecting a reliable trading platform, investing in a currency, and the hosting and security procedures necessary to maintain the investment. As a precaution, it is advisable to thoroughly research the trading platforms and cryptocurrencies where you wish to invest, and also diversify the investment to minimize risks and minimize exposure to large losses.
Just lets to remember that exchanges also can be hacked.
Not your keys not your coins