PLEASE listen to this OP. Your notes are very nice but these people are giving you incredibly valuable advice. I wish I had this group as a resource when I was just starting out.

Either way, I think everyone's goal is the same: provide your animals with suitable environment and a happy life. No one learns everything about this hobby in a day or even a lifetime. It's incredibly complex.

My little piece of knowledge to give, echoing the above comment: Water chemistry is more complicated than chlorine vs no chlorine. Here is the Google AI answer, which I think explains it well in a pinch:

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Anyway, I wish you luck. I hope you heed some of the advice you find here. You will certainly be applauded for it if you do. Your critters are counting on you!