Like all practical skills, practice!

Soldering new is easier than repair.

Get some dirt cheap ali express electronic kits and solder them up. Or get a load of components and some strip boards. Lead solder is much easier to use.

Basic antex iron. Stand with sponge...dab of solder on the iron, wipe on sponge, push iron against both board and component, feed in solder, admire.

For repair work, you want scrap boards real boards. Desolder all of the components, put them back.

Practice. Buy the fancier stuff once you know why it might be useful.

If you are going to do much soldering you need some kind of extractor. Flux in solder will cause breathing problems fairly quickly.