There's preparation that Jews do before the Passover, which is 8 days celebrating the freedom of the Jewish people from bondage.
You have to first free your home of Chametz.
"Chametz is "leaven" — any food that's made of grain and water that have been allowed to ferment and "rise." Bread, cereal, cake, cookies, pizza, pasta, and beer are blatant examples of chametz; but any food that contains grain or grain derivatives can be, and often is, chametz. Practically speaking, any processed food that is not certified "Kosher for Passover" may potentially include chametz ingredients."
"Simply stated (though not so easily done) — give your home a thorough, top-to-bottom, cleaning. Vacuum the carpets and floors, wipe clean the cupboards and bookshelves. Make sure you get into all those hard-to-reach places: under the sofa cushions, the spaces between the floorboards. Move aside furniture and kitchen appliances to get behind and underneath. Bottom line: if that proverbial cookie crumb could be hiding there, go after it!
As each area of the home gets cleaned, make sure that everyone knows that it's "kosher for Passover" and absolutely off-limits for any food to be brought in there. Practical advice: start with the bedrooms, then proceed with the living room and other common rooms, leaving the dining room and kitchen for last, so that you can use these spaces for eating chametz as close as possible to the "deadline."
Other places that need to be cleaned: office, car, pocketbook — any space that is yours by ownership, lease, or right of use.
Places you don't have to clean: a) Rooms and areas where you're absolutely certain that no food was ever brought. b) Rooms and areas that will be sold (see step 5)."
"Let's say that you own a liquor store. Or that you just bought a three-month supply of breakfast cereal on special. Or you live in a 40-room mansion and don't want to clean the whole thing this year. Is there some way of avoiding the ownership of chametz on Passover without getting rid of your chametz forever?
There is. Since the commandment to rid one's domain of chametz is binding only on a Jew, you can sell your chametz to a non-Jew, and then buy it back from him after Passover. The area where the chametz is held is leased to the non-Jew for the duration of the festival. This sale is not symbolic but a 100% legally binding transaction, and must therefore be conducted by a competent rabbi.
Designate the areas where you'll be placing the chametz you're selling. These can be cupboards, closets, rooms, or an entire house. Remember that you will not be able to use or enter these areas for the duration of the festival. Your local rabbi can transact the sale for you, after obtaining power-of-attorney from you to sell your chametz."
Getting Rid of Chametz Step-by-Step - Passover (chabad.org)
