Regarding soldering techniques they have all been invented long time ago and, let's get real, it is not the same to be soldering in a clean room boards that will go on a satellite payload than a quick and dirty repair on a sprinkler control which is inherently unreliable anyway and you can repair every year. I have done plenty of soldering which is nothing to be proud of but it was quick and sufficient for the intended repair.
What is important is to understand what factors lead to good soldering and what factors can lead to problems and why. Then a trained and experienced operator can decide what is best in each case.
Regarding the making of Youtube videos, there are two considerations, content and presentation and both better be pretty good unless one is so outstanding that the other does not matter. If you find and post a video of president Kennedy getting shot we will probably forgive the unstable and shaky images. On the other hand, if you have a perfectly choreographed show of cheerleaders bouncing their tootsies around I am not going to complain that I did not learn anything substantial from that video.
Some people think "Oh, my baby is so cute, let the world see how cute my baby is!". Those are the same people who think their farts have a very pleasant smell.
Youtube videos have become very competitive and need to have both quality content and editing. I think people do not realize how much work goes into making successful Youtube videos. Take
This Old Tony for instance. His videos have high quality content but are very funny, well scripted, well edited. Normally it would take a team of people to produce that kind of quality.
A lot of Youtubers just let the camera roll while they are doing something. "How to build a workbench!" and you see 45 minutes of a guy using a table saw and other tools from which you learn nothing because you already know how to use those tools. Some basic drawings, diagrams and plans tell you much more than watching the guy at work.
Have a basic script which is as short as possible while getting in everything indispensable. And then cut it in half.