Strongly recommended
Basic Soldering Lesson 1 - "Solder & Flux"
Why people recommend it
The opening lesson of the vintage PACE soldering course, regarded as the definitive grounding in flux, wetting and joint quality despite its age.
Watch for: Dated presentation style; the first lesson and lessons five to nine cover the essentials
In their words
Basic Soldering for Electronics - an ancient intro movie series by Pace Inc.
frr on electronics.stackexchange.com, Apr 2018. CC BY-SA.
The same issue, oxidation, can affect the targets surface, so when that happens you get to chase blobs there too.
got trolled too much this week on electronics.stackexchange.com, Oct 2015. CC BY-SA.
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When to use Flux ?
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