I was told when I first started using a computer not to click on links in emails. My daughter got caught because she was in a hurry and didn't read the email properly and $2000 disappeared from her account. Luckily the bank replaced it.
Recently, here in Australia, we started getting calls saying there was a problem with our computers and if we let them into our computer they could fix it. DH got the first call and just hung up. I took the next one and got really mad and said "no there's not and you're a scammer, he hung up fast. But the calls have stopped after the last two calls. When they start their spiel I just said, "I don't have a computer and you're a scammer"
These people make me so mad.