How do I recognize a computer scam?

Episode 925 (44:10)

Shamus from Colton, CA

Shamus got bit by a scam that asked for his credit card for a political donation. Leo says it's best to not give anyone his credit card number. He could instead tell them he will go online and donate. If the caller is offering to fix his computer, then that's a scam and Shamus was right to avoid it. Microsoft will never call anyone to offer to fix their computer.