When should I use MongoDB instead of SQLite?

I’m still keeping learning about Cockpit. What I have in my mind is to create a website with affiliate links and coupons like an ecommerce but without a cart, so I think that I can easily have a lot of entries every day.

Even If I’m starting, should I think about use Mongo instead of SQLite or is this nonsense? Any tip to help me?

Depends on your needs, if you plan to have lots of contents then go for sure with MongoDB, I would select SQLite only for local development or very small websites or medium websites that are fully static generated (and no use of the api).