Don;t bother with "Youtube tutorials" - most of 'em are created by people who have no idea how to make a video, how to teach, or - in most cases - how to code either. :sigh:
There are good ones out there, probably - but they are hidden by the wealth of total cr@p.
When you start coding for the web instead of desktop, you are entering a whole new world - where the bulk of what you used to use to create an app has been either removed, or seriously changed! Heck, the whole paradigm has changed as you are now in a multiuser client / server environment instead of a single user "this machine is mine
" way of working.
So ... treat it as a new "coding language" and get a book. Google will help: C# web development books - Google Search
] and start reading. You'll be able to "bleep over" some of it (the C# basics stuff) but it'll introduce you to the new way of working, of thinking, in a structured way that means you don't miss important stuff out because YouTube didn't even tell you it existed ...