Make sure you have anti-virus software installed on your computer and that it is automatically updating. However, keep in mind that no anti-virus can catch all malware; your computer can still be infected. That is why it's so important you use common sense and be wary of any messages that seem odd or suspicious.
To learn more, check out this OUCH! newsletter: https://securingthehuman.sans.org/newsletters/ouch/issues/OUCH-201603_en.pdf
More cybersecurity education available here: https://prezi.com/zkrdursavbgu/