First advice to newbies should be never save your secret key on your computer especially if you browse with it or your malware is not updated. Always learn to write your secret key/phrase in a book, print it out or save it on a flash drive as well but I prefer writing them and keeping the book in a safe (Waterproof and fireproof)

Seriously though, computer can be hacked at anytime and imagine losing all your funds because you haven't backed it up anywhere else. Never save it online like email, drive etc because that can be hacked as well.