* Making money from your own project is bad. You shouldn't put ads or charge a SaaS fee from your own project / startup / small business. But it's okay to be well paid by a FAANG as an employee.

* "I can build this over a weekend." - when someone posts their own project here

* "I don't understand why they need to hire so many people" - when learning that a tiny app (e.g., Twitter, Uber) has thousands employees.