This website is an excellent resource for reliable information about Judaism (free from the ubiquitous Christian misinformation about the religion).
‘Judaism 101 is an online encyclopedia of Judaism, covering Jewish beliefs, people, places, things, language, scripture, holidays, practices and customs. My goal is to make freely available a wide variety of basic, general information about Judaism, written from a traditional perspective in plain English. This web site has grown continually for more than 10 years and continues to be updated periodically.’
The information on the site is written predominantly from the Orthodox viewpoint.