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This is a very good video, covering the basics of soldering.

Ignore the American accent "sodder" rather than "solder" - the quality content makes up for it !

as ive been soldering stuff for nearly 50 yrs i consider myself good. that is a great video. explained perfectly. cleanliness and flux are the secrets. patience is also good. if the metal is clean and fluxed, liquid or paste, the solder will work perfectly. a great post

I did an apprenticeship as an Aircraft Electrician many years ago, twisting wires together and applying solder gives a pretty average solder joint, it also promotes wicking of the solder up the wire which can lead to embrittlement and corrosion problems.

The more reliable method is to tin both pieces of wire starting midway along the stripped wire applying the soldering iron, move the tip to the end of the wire whilst feeding in solder then run the tip back towards the insulation whilst feeding in solder, you want to avoid solder wicking up the wire under the insulation.

Once both wires are tinned place the two tinned wires end to end, touch the soldering iron tip to the center of the tinned wire and apply solder, moving the tip to get a nice flowing joint.

Less solder is often better but you want to end up with a nice shiny joint, if the wires move before the solder cools you get a cold joint (high resistance) which is often fragile.

I don't solder unless I have to, good quality crimps correctly sized and installed have the same or better electrical and mechanical properties of solder without corrosion issues and hassle.