Strongly recommended · for beginners
Basic Soldering Lesson 2 - "Soldering To PCB Terminals"
Why people recommend it
A PACE training film from 1980 valued as sound professional instruction on tinning wires and soldering to terminals, with basics that have aged well despite the retro production.
Watch for: Part of a numbered lesson series; some details are dated
In their words
Lesson 2 deals with tinning wires, and explains that you should not let the tin creep under the insulation:
pipe on electronics.stackexchange.com, Oct 2016. CC BY-SA.