Excellent advice and should be used by people to practice, that’s the only way to learn! And don’t do what i did when i was learning to solder (by fixing a 4x12” guitar speaker cab) and put the iron where it can fall over and burn a hole in the carpet. That really didn’t go down well! I did eventually move on to making my own guitar effects pedals but that’s another story.
There was a good Babani book on learning to solder which was available from Maplin but is probably available on the internet cheaply from the usual websites. Babani also made at least one book on constructing electronic model railway accessories but as with many of their project books many of the components are increasingly difficult to source as they have not been made for years and a modern equivalent may be difficult to find. Most electronic equipment is now surface mount and the old ‘through hole’ technology with discrete components isn’t realily catered for in the way it used to be. Many manufactureres have stopped production.
I have managed to get a supply of NOS tin/lead solder which works much better than the modern product. I know it’s not permitted in products to be sold anymore but it does make a huge difference. The flux pens referred to also help as hey are designed for electronic use and won’t corrode your wire or solder pads like some aggressive fluxes will.
I have only tried tosolder white metal once, never again!