Before clicking on a link or opening an attachment from an unknown source, it’s important to take the following steps:

1. Think carefully. Is this really what I wanted, or am I being tricked into opening something harmful?
2. If it’s a website, check the source. Visit the official website for any services that are being offered in the link, and make sure it’s from the right place.
3. If it’s an attachment, scan it with antivirus software before opening. You will need to download the attachment first and create a copy on your system.
4. For any other link, consider the purpose of clicking on it. If it’s too good to be true, it probably is.