A common method cyber criminals use to hack into people's computers is to send them emails with malicious links. People are tricked into opening these links because they appear to come from someone or something they know and trust. If you click on a link, you may be taken to a site that attempts to harvest your information or tries to hack into your computer. Only click on links that you were expecting. Not sure about an email? Call the person to confirm they sent it.
To learn more, check out this OUCH! newsletter: https://securingthehuman.sans.org/newsletters/ouch/issues/OUCH-201512_en.pdf
More cybersecurity education available here: https://www.youtube.com/playlist?list=PLQNZaWpmI1TfMOQMJ-ra1VSGgkuOPtFlA