Classes aren't bad, but "learn it in 21 days" tutorials are book material, and there's no way anyone here would want to write that. I put some LW classes up back in the day, and I guess I could make some more about various topics, but hosting them is another story... Plus that it'd take some skilled volunteers to make/write classes as well.

In short, this isn't possible without a bit of planning for sure.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram