[artimaeis]

You specified working with web and .NET Core (now just called .NET). Given the scope of modern .NET I don't think I can recommend a single book, but I've tried to order this in how I see them as most to least impactful for a dev.

For web dev specific guidance it's hard to beat ASP.NET Core in Action by Andrew Lock. Check out Lock's blog too at https://andrewlock.net, it's a great source of new features happening in ASP.NET. He does go into publishing an app on both Windows and Linux, with a decent guide to both. But you'll probably want to read through MSDN docs on that as well, I don't think there's a book that goes in very deep on that.

For generally writing modern C# using .NET, I like Code like a Pro in C# by Jort Rodenburg.

For a quick tour of modern C# features C# 12 in a Nutshell by Albahari is basically the reference guide. 12 is the latest, grab any of them from probably 7 up for a decently modern take.

[Fire-Dragon-DoL]

Ok, I have to figure out if asp.net is indeed in use