If you find interesting information on a website that you want to refer to, it is possible that this information will not be future proof.
The link or web address might change over time (link rot). Or the information on a website is updated, changed or replaced with other content (content drift).
It is possible to archive web pages on a web archive like the Internet Archive. You can capture a web page as it appears now for use as a trusted citation in the future (save a page). You will get an alternative link, pointing to the archived, static version of the page. Use this alternative link as a reference to the online information.