Here are sites recommended by ISTE (International Society for Technology in Education) for checking your facts.
Allows the reader to compare biases in the reporting
Monitors what is said by political actors in reports, debates, ads, etc.
Liberal research center monitoring conservative and corrects misinformation in the media
Allows users to find information on eRumors, disinformation, false news stories, etc.
Nonprofit website run by Center for Responsive Politics monitoring political fundraising sources
Pulitzer Prize winning website rates the claims made by politicians.
Pulitzer Prize winning site produces investigative journalism in the public interest
Independent non-partisan website fact checks rumors and false media
Non-partisan website uses public policy data driven journalism to provide transparency in politics.
Well sourced and thorough site that fact checks media stories. Known to be left-leaning due to checking conservative stories more often than liberal media.