I don't understand why people complain about online school.

true, though it's their job to teach me and answer my questions so I can get good grades for myself and for them and their reputation

True, but not at your beck and call when you click a button on your keyboard though! A teacher's reputation is irrelevant! How many teachers have you ever repeatedly thanked in your life?
Getting good grades is 95% your responsibility, not your teacher's!

When I was at school, I asked a question perhaps every 5 minutes, this is how I learned and could get the relevant answers - like everyone does if they don't understand and want to do well, as opposed to sit in the back of the classroom and be satisfied with not understanding.

The only reason I mentioned teacher reputation is that with a high performing school, if their class performs on average poorly, it reflects on their abilities and they will be taken into question by the head. If I perform, it obviously helps me the most, but it makes them successful at their job

I always thanked my teachers. I emailed them and got cards when I finished.

I agree it's personal responsibility to do well, but a good teacher doesn't hurt.

A good teacher does not hurt. That much is true.
You now seem to overestimate the capabilities of a school headteacher. Probably because most students don't have a clue what makes a good headteacher or even what a headteacher, they barely see usually, actually does!
And it is probably best not to assume that a headteacher has much teaching ability themselves!
And have you ever wondered why the number of non specialist teachers/supply teachers is increasing?

A good teacher does not hurt. That much is true.
You now seem to overestimate the capabilities of a school headteacher. Probably because most students don't have a clue what makes a good headteacher or even what a headteacher, they barely see usually, actually does!
And it is probably best not to assume that a headteacher has much teaching ability themselves!
And have you ever wondered why the number of non specialist teachers/supply teachers is increasing?

they are intrinsically linked to success. if you have a poor teacher who doesn't explain anything to you fully, doesn't mark homework or give feedback, is always late, doesn't answer your questions, doesn't suggest good resources, uses only powerpoints that are poorly made, your chances of success are undoubtedly lower. you go to school for an education, you can't assume everyone can pick themselves up at home (no laptop / stable internet, no money for expensive textbooks, no proper work space, noisy siblings etc). good teaching is essential.

as for headteaching, they often do have a degree or some teaching qualification so that they can work their way up. of course there are exceptions, but they will teach in a subject, get promotion to head of subject, promotion to head of year, promotion to assistant head, promotion to deputy, promotion to head. this is not uncommon!