I've learned from watching YouTube videos, but it was a pain at the time.
There are so many DF Let's Play Tutorial--but most of them are waste of time.
Because, really, when I search YT, "Dwarf Fortress Dig A Well"--I would get a list of videos, but the portion of building a well is somewhere in minute 45-47.
The basic key strokes of building a well is in the wiki, sure.
But the actual motions of digging, having an idea on where the water will be, and how to breach the river from z+0 to feed in the fort without flooding the whole thing... where's that easy tutorial?
Really, it should be at most a minute video. I have had to write down notes, making my own descriptions on what that task is, and referenced time stamps to which bookmarks I have to watch the video again, and also write down the keys being pressed. Not all DF videos have that extra app that displays keypresses, which is really nice.
I would say that CaptainDucks video are great intro/tutorial. But I think it would be worth improving a community tutorial by having the wiki style search pages; updated to point to the correct video time-stamp snippets that covers the question/topic,. Without slogging through 30+ minutes or hours of video just to find that one hint, it would increase the likelihood of easing the learning curve.
Just imagine going to the wiki on "Digging a Well" and then have a bunch of pages, each with descriptions, and transcripts of key presses and steps, and links to the video to see how it's done.
Now make that an app, so someone from work without playing DF can go browse and learn DF using their phone.
edit: typos.