Wire stripper and twister - GIF

[Frank S]

Hmm, nothwithstanding the quality of the cable twist created by that tool, soldered connections are, AIUI, not acceptable here in UK. Crimped or WAGO joints and similar maintenance-free connectors are preferable.

yeah the only time you will find soldered connections here either is in low voltage applications I've seen some silver brazed connections in 4300v panels and in 600v DC always backed up with another means of securement.
Some photos of acceptable connectors in various parts of the world
almost the only type of connector used in house wiring in the middle east

very popular in the USA

My preferred after a connection is tightly twisted, if the wire is stranded I like to solder as well then these are crimped over the connection