Its pretty fundamental stuff to know the difference between what is server side and what is client side. I think you will have a lot of trouble undertanding a framework without this.

Blazor WebAssemly requires you make explicity Ajax-like Calls to external web services in order to interact with a server and data. There is no server side framework in WebAssembly for maintaining state. State is entirely client side.

Blazor Server basically uses Web Sockets (with fallbacks) to communicate changes between client and server, this is far more efficient than using http request calls. State here is server side. But differs from all other frameworks in that state is trasmitted over sockets not http requests.

I'm not convinced you have actually used any kind blazor tbh