This is correct, but remember that it can be just ONE act. For example, I light candles to welcome Shabbat. That is a ritual with just one action.
There are actually a great many things I do to set apart Shabbat and make it holy for me rather than an ordinary day--as you can see, I enjoy a lot of ritual (I believe you get out of it as much as you put into it). But even if the only thing a person does is refrain from going to work, that would still be a ritual of one action.
Here is my Shabbat ritual:
Thursday evening:
Friday late afternoon (be home by 1:00 or before) until just before Shabbat, in order:
- begin playing Shabbat music to get in the mood
- begin making challah, and clean up the area from flour dust
- take bath
- make soup and when done put crock pot on low
- begin making dinner, starting with things like salad, or that take the longest time to cook, and can be kept warm
- set the Shabbat Table with special table cloth and best dishes
- remove from view all objects that might tempt me to break Shabbat (i.e. matches, TP, money)
- take out kleenex to replace TP
- unscrew refrigerator light, and turn on or off lights as they will stay during shabbat
- water all the plants
- turn phone off
- put on extra nice clothes
- make sure makeup is put on before candle lighting
FRIDAY NIGHT: SHABBAT BEGINS
- light candles and say blessing at proper time
- once a month, attend synagogue
- say kiddush (blessings before eating)
- enjoy dinner
- sing Shalom Aleichem
- do birkat hamazon (grace after meals)
- rinse dishes but do not wash
- sit on the porch and appreciate the stars
- read (usually something of a religious nature)
- go to bed
SATURDAY: morning until the end of Shabbat
- sleep in as late as I feel like
- don't get out of pajamas
- have a light brunch of soup from the crock pot
- read the Torah portion for the week, pausing to think what it could mean for me
- go online and read various commentaries for it
- read the Haftarah, and meditate upon its meaning
- have free time doing pleasurable activities. could be anything from reading fiction to practicing Hebrew to posting on online religious forums -- but try to keep it in the spirit of Shabbat.
- snack on special foods bought just for Shabbat, like muffins or crackers and hummus
- get dressed and go for a walk, appreciating nature, being sure to pray blessings of gratitude, and stopping at various neighbors' homes to say hello.
- eat leftovers for dinner
CLOSE OF SHABBAT AT TWILIGHT
- do Havdalah ritual
- turn on phone
- read mail
- do dishes
- watch TV!