The mitzvah of Oneg Shabbat in relation to hekdesh

How does a davar sheyesh lo matirin/an item that is temporarily forbidden work?

Can a boy wear a necklace made from a used coin?

When gneivat daat is allowed

How much time does one who was overcharged for a purchase have to claim a bad sale and get his money back?

When parents promise their kids an "afikoman present" on Pesach, do they have to keep their promise?

People who don't stand by their word are cursed and untrustworthy!

Can moveable products only be purchased by kinyan meshicha or with money as well?

When a buyer claims that his purchase was unfair as actual price of the item was inflated or false

How a ring can be effective for kiddushin when we learn that money cannot be used for a chalifin transaction