TypeScript's own docs are pretty friendly and in-depth for both reference or getting started: https://www.typescriptlang.org/docs/home.html https://www.typescri

TypeScript's own docs are pretty friendly and in-depth for both reference or getting started: https://www.typescriptlang.org/docs/home.html https://www.typescriptlang.org/docs/home.html Alternatively, Basarat's guide is excellent, and works well as an intro followed by a detailed guide that you can work through step by step: https://basarat.gitbooks.io/typescript/docs/getting-started.html https://basarat.gitbooks.io/typescript/docs/getting-started....