What is the time for the intention to fast the make-up of Ramadan?

My sister used to work in a sewing shop, and the owner of the shop offered it for sale. Working in the shop was comfortable for my sister, so I bought the shop and agreed with her that the profits would be split equally between us, and she would also have a fixed salary for her work in the shop, while I would cover all the shop's expenses, including electricity and others. Is such an agreement permissible?

What is the time of intention for making up a voluntary fast that was invalidated?

What is the ruling on listening to music while exercising, provided that it does not distract from prayer and remembrance?

What is the time for the intention of expiation fasts?

Is dancing for sports and women's gatherings at celebrations permissible?

What is the time for the intention of fasting the expiation for hunting, shaving, and enjoyment in Hajj?

What is the ruling on playing the piano?

What is meant by the legal daytime?