The authoritative free documentation from Microsoft, the most-upvoted single resource across multiple r/typescript threads. Covers everything from basics to advanced type manipulation.
https://www.typescriptlang.org/docs/handbook/intro.html
Other than that, typescript docs are much better than they once use to be. Still missing a lot of content but the stuff they have is easy to understand so would highly recommend going through them.
The most-recommended TypeScript resource in the community, built by the go-to TS educator. Free beginner course plus deep paid workshops covering advanced types and real-world patterns.
Spaced-repetition interactive TypeScript courses with basic, intermediate, and advanced tracks. Praised by Reddit users for hands-on practice that actually makes concepts stick.
Completely free beginner-friendly TypeScript guide with thousands of hours of coding practice. Recommended by r/typescript users as a solid starting point alongside the official docs.
A community-curated learning roadmap that maps out every important TypeScript concept in order. Not a course, a structured index that tells you exactly what to learn and in what sequence.