Most web sites are not verified by editors and fact checkers. Look for e-mail, contact address and phone numbers. You want to find out if the author is qualified to write the web page. Look for names, where they work, credentials, addresses, e-mail addresses. Look for the URL domain.
Some sites are thinly disguised commercials or opinion pages.
Check for dead links and outdated information. If you see a date listed, it may be the date of posting or the date of revision. Good web sites should contain a statement explaining or summarizing topics covered on the site.