it depends on how you secure your bitcoin wallet, and how safe is your computer from virus or hack program, nowadays there are many downloadable exe that can get info in your computer, and about usage of bitcoin if it safe , yes it is safe, always double check the address before sending bitcoin , you wont be able to get it back if you send it in the wrong address anyway. goodluck
Yeah Just saw an app too that will change the btc address of what you're currently sending and you wont even notice it because its not visible. It will just change once it undergoes transaction in your wallet.