I'm an experienced developer, but my .net has been mostly webforms and only a little (very customized by that company) mvc. I'm working on learning core. But..I'm kind of confused by the options. Apparently there are things that can be done on core that can run on any platform, but within core there is also 4.7.2 that can only run on MS stuff? And there are razor pages, and mvc pages? I started to do a tutorial and I have vs 2017 but they had 2015, and it said pick .net 5, but I have no 5. Can someone break it down or point me to an article (not MSDN..that just made it worse).
Like what is in what version and what the most obvious options are? Hope that makes sense.