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How to be respectful in a jewish environment
Familiarize yourself with the 5 main branches of judaism.
They are, from most stringent to least observant: chasidic (hasidic), orthodox, conservative, reform, and reconstructionist. Keep in mind that each of these main branches have several sub-branches with varying degrees of differences.
Ask your jewish friends which branch (es) they practice and how to behave. Understand that followers of chasidic and orthodox judaism, generally wear modest attire that is not overly revealing.