Recommended
*EXPERT LEVEL* Soldering Tutorial #1 TTC Avionics
Why people recommend it
Part of a NASA standard soldering series showing how to tin wires and make high reliability joints, more than hobby work needs yet instructive.
Watch for: Expert level standards; take the habits, not the pace
In their words
This is an example that I consider a very good one.
Schizomorph on electronics.stackexchange.com, Aug 2017. CC BY-SA.