Why I think the t3 stack is the next big thing in the JS... oh wait... the TS ecosystem?

Hey Bashar! Typescript is something you'll just pick up as you go. Just start off with the basics of Typescript so that you have an idea, of how it works and the syntax and then just start applying it. Firebase is a good alternative to NextAuth. If you're using NextJS, then NextAuth is probably the best solution out there, and it just works really well with database providers like Prisma out of the box.