Anecdotally when I've had to show developers how to start with .NET Core the problem isn't the SDK (install dot.net at the website) or which template to use (i.e. just tell them to pick that one) its C#. This is especially true if they come from a JS, Python or Go background. I say this as someone who does doesn't mind C# and thinks its pretty capable once the learning curve has passed.
At one stage I had a JS developer just try the F# template instead and the difference was stark. Explained to them Async F# - Promise JS, Module F# - Module JS, showed them a unit test example and they were writing production code in two weeks to a month. It made me realise that over the years there is a lot of knowledge I just take for granted that many beginners just don't have especially now when there are much friendlier languages for beginners. Things like dependency injection, how it resolves based on types, and which framework to use and why, mocking framework choice (vs simple stub functions), can only mock interfaces and why, the class structure and how you should group functions into appropriate classes, abstract classes vs interface default methods, LINQ vs OO style coding, nullability annotations all over the place, OO design patterns, the need for Resharper or equivalent unless you can write C# syntax from scratch, the list goes on and on. With most C# apps there is a lot of knowledge assumed and baked in which can be daunting for a newcomer. C# is not alone here I understand that - the same thing can be said for other languages too. But it has made it harder than it needs to be especially when it is actually a good platform but C# scares many developers away especially as it adds more and more features on top.
Litmus test for a language to me: Does it need an IDE and tooling to be productive in? The more tooling it needs the more complex IMO the underlying language is in syntax and complexity. Complicated refactoring tools? If so its probably too complex for a beginner especially now that the language space has quite a bit of competition. As an example watching a developer do this in a previous role in F# you just create a new file and cut and paste the functions around; in C# the dev's I've had usually resort to Resharper and a full blown IDE to extract variables/methods, do code generation, and basic refactorings unless they want a lot of manual work.