At a shabbat service at your home or at a synogauge you may light the shabbat candles and say the shabbat blessings. Also some people follow it with hallah and/or a kiddush.
They celebrate Havdalah.
integrity
Yes only when Shabbat is over. For conditions of life and death, it is permissible to do "work". For example, ambulances still run on Shabbat because people could be seriously injured on Shabbat and need medical help.
People behave politically because that is like a law the government made
People behave very nicely on Diwali. They greet each other.
They prepare their children for Shabbat and light the Shabbat candles.
Too many rules and restrictions
Yes, even on Shabbat.
"Shabbat Shalom!"
They're called Shabbat candles (Neirot Shabbat in Hebrew).
After Shabbat, there is the Havdalah service.