Yes, you can either solder them or fit mechanical (threaded) fittings.
Take either an SOS pad or a wire brush and rough up both the inside of the brass fitting and outside of copper pipe, put the copper pipe into the fitting and solder around it.
Certainly look up Flagg Flow T.P Fittings T.P thread-less copper fittings will FIT on schedule 40/80 /120 Brass pipe Ideally it should be brazed but soldering will hold domestic water pressures Also many solder fittings ARE CAST BRASS rather then wrought copper
Always and only solder.
*Yes you can solder brass, as long as it isn't the decorative polished brass. They have used brass fittings in plumbing for years and years. It has the same characteristics as copper.
Solder can be used on any grade of brass or copper.
Solder, (lead + tin); Brass, (copper + zinc); Bronze, (copper + tin).
For basic plumbing fittings, either copper or brass fittings is your best bet. Copper is more for just water lines, and brass is for various uses, but more expensive. Sites like DrillSpot.com are great places to start looking.
Yes, as long as there is a mechanical connection , ie threaded. You cannot glue them to each other.
Tin, copper, lead. (So Bronze, solder, brass.)
Brass is an alloy of Copper and Zinc. Originally solder is an alloy of Tin and Lead. Lead-free solders in commercial use may contain tin, copper, silver, bismuth, indium, zinc, antimony, and traces of other metals.
That would depend on the temperature "Temperature pressure relationship" and the fittings used