Of course it’s gonna be hard if you are trying to learn a language plus a framework at the same time, especially given that F# is treated as a second class citizen by Microsoft. An easier path is to break that learning into more manageable tasks: on one hand getting familiar with F# (which is already some work as it has both a functional side, and a CLR one; you need more the OOP part for doing ASP.net) and in the other ASP.net, for which the golden road is C#.

Otherwise the doc is quite good for ASP.net Core, and it’s rare I get stuck on a problem for too long with it.