From Reconstructionism to ultra-Orthodoxy, Judaism is richly diverse.
Of the three largest denominations, Reform is most common in the U.S. – but nearly as many U.S. Jews do not identify with any particular branch.
Here’s what you should know, according to a Jewish studies professor:
https://theconversation.com/jewish-denominations-a-brief-guide-for-the-perplexed-207297