Ultimate Courses (ultimatecourses.com) is the online course platform of Todd Motto, a UK-based Google Developer Expert for Angular and one of the longer-running independent voices on the Angular and TypeScript stack. The platform also covers Vue, RxJS, and JavaScript fundamentals.
The course catalog covers Angular in depth (the framework from its early TypeScript-era through current versions), TypeScript (compiler internals and advanced type-system patterns), RxJS and reactive programming, Vue.js, JavaScript fundamentals, and the broader modern front-end ecosystem. Material is taught at the level of comprehensive reference work rather than introductory tutorial.
The CourseFlix listing under this source carries 9 Ultimate Courses titles spanning that range. Material is paid; Ultimate Courses runs on per-course or membership pricing on the original platform.