Just because a news source may be categorized as "Center" doesn't mean that's always true. As you become more informed and aware of your own center, you will be better equipped to see bias.
Austin-American Statesman (Local)
https://www.statesman.com/
NY Times
https://www.nytimes.com/
YAHOO! News https://news.yahoo.com/
abcNEWS
https://abcnews.go.com/
CBS News
https://www.cbsnews.com/
NBC News
https://www.nbcnews.com/
POLITICO
https://www.politico.com/
The Washington Post https://www.washingtonpost.com/
AP (Associated Press) News
Reuters
newser (summaries)
BBC
Bloomberg
USA Today
Real Clear Politics
The Washington Times https://www.washingtontimes.com/
Fox News
https://www.foxnews.com/
NEWSMAX https://www.newsmax.com/
The American Conservative https://www.theamericanconservative.com/
NEW YORK POST