Technically speaking, because we have HUGE mountains...even if on the whole the Earth is a relatively flat plane ...you could still say it is not flat. The question I am disappointed that wasn't asked & then answered: is the earth a globe spinning around a sun in our Solar System, which is spinning out amongst countless other solar systems, which are spinning out in the universe as a whole?...basically what we have been taught from birth. True or False?

You are correct, the Earth certainly isn't a geometrically perfect sphere. The idea espoused by Science is just the generally spherical shape.

As to your question, pretty confident the answer is True.