Mag Jiraboondilok

With Blazor, depending on the UI you want to build, html and css may be unavoidable because you might have to use Bootstrap, flexbox, etc to properly position and customize the elements. You may be able to get away with using 3rd party component libraries, e.g. Radzen, Telerik, etc., but again it depends on your app. I haven't had to use Javascript much actually, a couple use cases where I've had to was for file downloads and window events.

From my recent job search I've found that Python by far will land you the most opportunities, and in terms of web development I would look into Django or Flask primarily. Some other options, if Python isn't your thing, would be Java (Spring Boot), JavaScript (Next.js), Go (gin), or Ruby (Ruby on Rails).