[xdude]

When it comes to Internet nothing is 100% secure. But in most cases problems happen due to human error. Easy passwords, easy to guess passwords, Key Loggers etc. But if you are using a private computer then it's mostly safe unless you get something like key logger. But it gets worse in other devices like Phones and tabs. Beside technical short comings we have to be careful when we use public wifi as well as keeping Bluetooth enabled.

Also has to make sure logout from everything and remove all private or sensitive date from your device before giving it to a repair person or shop. If you can't then you have to get it repaired infront of you.