how do i fix eyes to twisted wire cable correctly, twist each bunch of strands(6) or each single strand(120)?

Answer 1

Several ways.
1) And best is to splice an eye in. I have several halyards (lines holding sails up) on my sailboat (47 foot S&S) with spliced eyes. They can withstand 1000's lbs of force without parting with minimal (less than 6 inches) of wire spliced. How to do it? - Google 'splicing', but you should have to only splice the bundles.

2) Great for high load also. Press fittings or swage lock fittings. (Available at hardware stores).

3) Great for lower load situations. Lead crimps. Run wire through in one direction, make loop, run wire through in reverse, crimp with pliers or pound with hammer. (Available at hardware stores).

4) Great for low load situations. Similar to above but consist of a u-bolt/plate. (Available at hardware stores).

Answer 2

idk