Draining inground hot tub

Newbie pool owner so my knowledge of how an inground pool works is extremely limited .

I have an inground hot tub  next to the pool.  I want to drain water just  from the hot tub to give it a good cleaning .

what are step by step instructions to drain water from hot tub into the pool. How do I do this? What valves need to be tuned in or off?

whst are step by step instructions to clean and scrub  hot tub once water is drained

what equipment or chemicals are needed to clean the hot tub?