Fullstack.io is the technical book and course publisher founded by Nate Murray, Ari Lerner, and team — known for the ng-book Angular series, the React Quickly books, and the fullstack React series that anchored a generation of working developers' first deep-dive into modern JavaScript framework material. Fullstack.io has since rebranded to Newline for its newer course catalog.
The book / course catalog covers the modern JavaScript framework landscape — Angular, React, Vue, GraphQL, Node.js — at the level of comprehensive reference works rather than introductory tutorials. The Fullstack.io style is unusually rigorous about the underlying APIs and edge cases that ship projects to production.
The CourseFlix listing under this source carries over 20 Fullstack.io / Newline courses spanning that range. Material is paid; the original platform sold both per-course access and membership tiers. Courses are aimed at developers ready to move past introductory tutorials into the depth of a chosen framework.