Soldering is easy, especially if you have already done it several times before. Just grab the nearest piece of solder. Fire up the soldering iron with the most oxidized tip. Wonder why it cannot melt the solder and increase the temperature to maximum. At that moment you realize that it is probably a tinned solid copper wire, and it is time to grab proper solder.

Now the iron also reached its final temperature so that it is set up to smudge things together and create an indistinguishable composition of wire, solder, burnt flux, charred insulation, and components.

Of course, that is not top-notch soldering, and there are certain areas where you do not want to gamble if the solder joint will make it until the end of the day. Areas like aviation and space, where a failed soldering joint can ruin your day.

Knowing that, it is easy to find material explaining how high-quality soldering can be done. There are excellent tutorial videos available on YouTube:

Part 1 – soldering connectors: 🌐https://www.youtube.com/watch?v=0SnOW2VdCTI

Part 2: 🌐https://www.youtube.com/watch?v=BiVkI4IooH4

Part 3: 🌐https://www.youtube.com/watch?v=zusJSKeXGHE

Part 4: 🌐https://www.youtube.com/watch?v=yzkuWORme2w

Part 5 – soldering PCBs: 🌐https://www.youtube.com/watch?v=Vynb_HdEIDU

Check also the videos on how to repair coaxial cables: 🌐https://www.youtube.com/watch?v=9e9amerUNEU

These videos are based on the 🌐NASA Student Handbook for Hand Soldering that you can find online 🌐https://s3vi.ndc.nasa.gov/ssri-kb/topics/33/

Check also the other documents from that page.