I fumbled around looking for some - this is what I found to get me started.
https://mva.microsoft.com/en-US/training-courses/introduction-to-asp-net-mvc-8322?l=Omf358Zy_1604984382

I'm expecting this all to be very difficult for me ..at least at first. I've never done any kind of web development at all - so I do not know any HTML or CCS or Java at all. Frankly I think that I would be able to learn how to make C# desktop applications a lot easier than all of this. But - the boss here told me to to try to pick up on some ASP.NET MVC over the next few weeks, ..and they're the ones paying me - so that is exactly what I will do.

>I've greatly enjoyed ASP.Net MVC. There are learning materials at www.asp.net. The walkthroughs will help supplement video training. You will be REALLY frustrated at first because things won't work and you won't know if it's MVC, JavaScript, the browser, HTML, or CSS. You'll soon learn how to figure that out.
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>For videos, look at pluralsight.com and microsoftvirtualacademy.com
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>One more thing. MVC 5 (the current release) is VERY different from ASP.NET Core 1.0 (previously called ASP.NET 5 and MVC 6)
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>>I think I'm pretty much in the same position right now. The last several times I've got a job with VFP - I've told myself that this will be the last chance I get to have a job using VFP and that I need to start to learn something else. My current job was only supposed to be a 6 month contract to maintain their VFP app while they migrate to something else. Uhhh that was 7 years ago. I guess that had some failures and issues trying to get a new system in place. Well now they have finally got the new system in place, and I've been told I got till the end of march. In the meantime there isn't a great amount of stuff for me to do, so last week they told me to start watching asp.net mvc training videos. I've never been paid to watch training videos..and I've never tried to learn a new language by watching videos either - so we'll see how this goes. As for the prospects of VFP consulting - it looks pretty bleek to me. There just are not that many using VFP anymore - and those that are either have something that is stable and need to help with it, or just want to get rid of it and move to something web-based. As for hourly rates it seems to be all over the place - but I think its gone down a fair amount over the past 10 or 15 years for VFP developers. You could probably get away with making VFP consulting a side-gig to make some extra income - but I doubt you'd be able to do it and nothing else and find enough work to keep you busy enough to make it the only source of income. That is just my opinion though - hopefully others with reply.