Yes, the compression fittings designed for copper work on both soft and hard copper pipes.
Yes they have compression joint fittings for copper.
no
Unroll it and use as you would normal hard copper. Compression fittings or soldered fittings.
No. You can use flared fittings with a flaring tool and soft copper pipe.
You may mean Qwest fittings. (yes, with a 'w' not a 'u') This is a range of plastic plumbing compression fittings to fit many different pipes. They have an 'O' ring and a gripper inside a large nut to tighten onto the pipe. -Very hot item when they came out 20 or so years ago, now a little old fashioned compared to Sharkbite and similar fittings.
I believe it has to be flared as compression is not approved
If you have slip compression fittings (brass/PVC) on your bath tub over flow and drain then you need to have a adapter PVC glue to compression before the trap running vertical and you will also need a access to inspect the compression fittings by most codes. I use glued fittings on all my tub drain and overflows because its the best kind of connection and you don't need access to it.
The correct compression fittings.
No. Compression fittings are NOT for steam pipes
Ghji
Compression fittings are used to join two tubes or pipes together. Typically it is used when the two pipes are different materials or different sizes. They are also sometimes used on pipes where it is difficult to solder or maybe dangerous to do so.