Hello,
I self-study programming, I'm building a project with:
NextJS Typescript Prisma Postgres Zod RHF Tailwindcss ShadCN Better-Auth Resend Vercel

I built around ~4000 lines of code, and now I understand that I have to do tests.
When I created the project, I did the default of nextj16.
What testing tool is better for me? What is the reason? Do I need to do something with this Turbopack thing (I'm new, I don't really know what it does)

Thanks for help!