You can make a bunch of mistakes as a newbie. Here's the "general idea" or starting point.
So, What's the Deal?
Let's just say a person was getting into Chickens. I think the most useful page would be one that answers their basic questions FIRST. Like, an orientation....Like, don't proceed without AT LEAST having this information to ground yourself.
This is going to be sort of lengthy page. I might divide it into several and the links you will need will be interspersed.
I will proceed in Question Format most of the way.
HELP! Sick Fish! Twenty Steps to fish health. You LITERALLY can solve almost any Koi or Pond health outbreak with these twenty diagnostic steps and nothing's hard. But it's not "here's your pill" either. Downloads are available.
DrJohnson.net More than koi health, this site spans all things animal, by a real veterinarian who shoots you straight.
Fishdoc.co.uk By Frank Prince-Iles. A UK authority who put this site together some time ago and which is still relied upon as a major source of good Koi and pond fish information
If you need pet information AND Koi pondfish and pond information you might like DrJohnson.com which has everything from pet info, to vet info, to koi and pond fish. It has it ALL! Pet Information.