Dominic Elm is a German software engineer and one of the more visible independent voices on WebAssembly — the binary-format runtime that runs in modern browsers (and increasingly outside them) and lets developers ship languages other than JavaScript to the web.
His CourseFlix listing carries Learn WebAssembly — a structured treatment of the WebAssembly platform: the binary format, the JavaScript interop, building Wasm modules from Rust / C / AssemblyScript, and the patterns for using Wasm in browser and server-side runtimes.
Material is paid and aimed at developers building applications that benefit from WebAssembly's performance characteristics. For broader content, see CourseFlix's WebAssembly category page.