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Good soldering takes practice. Now for my important 2 cents worth.
1. Wear a face shield. Hot solder can spatter and all you need it to have some fly into your face or worse yet your eyes.
2. Keep a small ABC dry chemical fire extinguisher within easy reach and also a pail of water and some rags.
3. Clean all parts to be joined together. Inside and out Clean joints have a much better chance of soldering well than any that aren't nice and shiny cleaned up.
4. If tired, have had too many beers, are angry or in any other manor not clear minded, please don't try soldering. Go rest
5. Try soldering some odd pieces of copper pipe and fittings. Practice on them out in the open where it's easy to work and you're less likely to set fires. I hope the serious plumbers can give ideas on what paste flux is good and what's bad.
In my old house most of the soldering was done with a 50/50 lead-tin solder and older acid flux. Today that's not allowed.
What exactly is your expertise? I don't see an occupation listed in your profile. Your advice on soldering seems to lack experience.