If you are a Business Central AL developer with no or little knowledge of web development, you should read on.
Did you know that Anders Hejlsberg was the original author of Turbo Pascal which must have been an inspiration for C/AL and that he is a core developer on TypeScript?
My point is that as a AL or C/AL developer you will fell quite at home with TypeScript. Give it a try.
This tutorial will guide you step by step to write a small web app.