Take a look at these courses on Elixir/OTP[0] and Phoenix LiveView[1] from Pragmatic Studio. Both of them together I felt gave a well paced overview of elixir servers, and Phoenix framework from a good starting point even for beginners as you seem to be looking for. There's a combo price deal if you by both courses.

[0] https://pragmaticstudio.com/courses/elixir

[1] https://pragmaticstudio.com/courses/phoenix-liveview