The blessings of the Havdalah ceremony mark the end of Shabbat.
Friday
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.
Only in years where Yom Kippur happens to fall on Shabbat (Saturday). Otherwise, no.
They prepare their children for Shabbat and light the Shabbat candles.
"Shabbat Shalom!"
Jews do not call the sabbat "Saturday", it is called 'Shabbat'. Shabbat happens to start Friday at sundown and ends Saturday at sundown, the 7th day of the week.
They're called Shabbat candles (Neirot Shabbat in Hebrew).
After Shabbat, there is the Havdalah service.
Shabbat Shabbatot
Shabbat is a time of relaxation, people will read, study, and visit with family and friends.
In 1998, April 11th was Shabbat and also the first day of Passover. It happens, but not very often.
Shabbat comes from the Hebrew word for sit/rest. Shabbat is the day of rest.