This guide offers practical information on keeping goldfish, from aquarium setup and feeding to health and daily care for these popular pets. Goldfish are among the most widely kept freshwater fish in the world, yet their care is often misunderstood. This guide, compiled with the help of artificial intelligence, brings together practical information on setting up a suitable tank or pond, maintaining water quality, choosing the right diet, and recognising common health problems before they become serious. Whether you are considering your first goldfish or looking to improve the conditions for fish you already keep, you will find clear explanations of the key factors that contribute to a healthy and long-lived animal. Topics covered include filtration, suitable tank mates, seasonal care for outdoor ponds, and the behavioural signs that indicate whether your fish is thriving. No prior expertise is assumed. Goldfish are among the most widely kept freshwater fish in the world, yet their care is often misunderstood. This guide, compiled with the help of artificial intelligence, brings together practical information on setting up a suitable tank or pond, maintaining water quality, choosing the right diet, and recognising common health problems before they become serious. Whether you are considering your first goldfish or looking to improve the conditions for fish you already keep, you will find clear explanations of the key factors that contribute to a healthy and long-lived animal. Topics covered include filtration, suitable tank mates, seasonal care for outdoor ponds, and the behavioural signs that indicate whether your fish is thriving. No prior expertise is assumed.