Help setting up a monorepo manually

as I had issues with nx and turborepo… and my app being on the smaller scale for now. I figured I would set my own monorepo (very basic with typescript), however it seems like tsconfig is making me wanna rm -rf / … It is either a problem of my libs not being registred, angular not wanting composite to be true… fastify for no reason… not liking my lib (again)… is there anyone who can help me? either with explaining what I am doing wrong with nx or pointing out the issues in my handcrafted monorepo?