My first word was "fish", and my earliest memory is of the fish tank my parents had while I was a baby. I think this image inside my head, and vague memories of my mother cleaning the tank, are the main reason why I was initially interested in the hobby.
Starting with a 10 U.S. gallon tank and easy fish like Zebra Danios, and some Cory Catfish, I quickly upgraded to a 55 gallon tank and at one time having seven tanks in a relatively small apartment. Eventually, after buying a house, I 'consolidated' things and now have two 125 U.S. gallon freshwater tanks.
I've ordered fish online, but now primarily use a store called Animal Island in Midlothian, Illinois. This store accepts fish returns for partial store credit, so I have used this to keep many different types of fish, gaining experience in a short time about a huge number of species.
My favorite fish so far: Vulture Catfish (2014):