One way to check if a website is safe is to use a tool like Trend Micro's Site Safety Center or Norton Safe Web, which both allow the user to enter a link and see information about any threats it may pose. Another option is to look at the browser's color-changing indicator, which usually indicates a site's legitimacy, or looking for "https" in the address to see if a site is secure.
Other websites that provide safety information on specific links include hpHosts and Unmasked Parasites. These websites can be helpful for checking if a site has malware or tries to steal a user's data. There are also browser add-ons that can provide reputation and safety information about a website the user is viewing, such as AVG LinkScanner.