If you had to learn ASP.Net yesterday, how would you start?

I'm a Python/PHP/Ruby developer that has to pick-up ASP.Net is a pretty big hurry to support a project that has gone off the rails (hehe).

I'm not so worried about my capability in learning, but the time in which I have to do it. I've spent the last few evenings reading as much as I can on C#, ASP.Net versions (WTF! Seriously. v5 then Core?).

Anyway, if you have used a particularly good course/resource to learn ASP.Net, please share it. Thanks!