The purpose of this difficult exercise is to produce the wire assembly as shown in the diagram.
Make it 100 mm high and 100 mm long.

This is best done using REFLOW SOLDERING.
Reflow soldering means TINNING each wire separately, by heating it, and allowing solder to melt on the heated wire where required.
Once the wires have been tinned they are brought together and the solder on both pieces of wire is remelted and the joint made.
Adding more solder may be necessary.

Avoid excessive movement.
Joints must be smooth and shiny not dull and crinkled.

Avoid holding the wires too near joints with pliers etc.
These will act as heat shunts and will draw the heat of the iron away the joint.

To make this exercise more difficult, use 1mm bare copper wire, which can be found as the earth wire in mains cable.

The finished item must be able to withstand the "wiggle" test, where all joints are wiggled to ensure that they are sound.
It also must be able to stand up on its own.