newbie here , how much free resources are allowed on a free tier account?

newbie here , how much free resources are allowed on a free tier account?

i will be deploying APIS with flask, any simple tutorials for flask?

and are there any advices for deploying flask apps ?

did anyone deploy a AI API here on fly with flask?

and how much free resources are allocated per month on a free tier account?

can anyone answer these questions?