A buddy got me interested, in 1968. I was 15 years old. He had TWO 10 gallon tanks, and a copy of the Innes book "Exotic Aquarium Fishes".
I was HOOKED! I soon got my first tank. It was a Metaframe 10 gallon, with an incandescent hood and a clear light bulb.
I knew nothing of the Nitrogen cycle, nor did the LFSs. The only advice given was to add fish slowly, not to buy them all at once.
Also to use Dechlor, usually a small pricey bottle, with a teaspoon for 5 gallon dosage!
I bought two Silver Angelfish and a Leopard Corydoras! Those first few weeks, I think I did about 4 100% water changes, along with washing the gravel in a bucket! Surprisingly, the fish survived.
Back then, I was led to believe the charcoal removed all the nasties from the water, so the only water replaced was from evaporation, or when things got looking crappy.
I got a BIG 29 in 71, and had the good stuff! A Dynaflo 600, Magnus piston air pump, and my trustier Silent Giant!
I can look back now on a few fish losses I had in the 70s and 80s, and realize they were due to ammonia or nitrites.
In 95 or so,I was keeping a 65 full of African Cichlids, and a 50 with SA Cichlids. I had kind of let maintenance go a bit, and the new wife talked me into getting rid of them.
In about 99, i decided to try Discus again, and bought a 130 gallon aquarium. In the past my Discus would turn black after a few months and die. With a bunch of Internet research, it was obvious lack of water changes had been my issue. Also Nitrogen cycle was being discussed at length. Cycled this tank with Goldfish, and put them in my pond after. Not the best way to do things, but it worked out. Grew out some incredible Discus in this tank.
Took another hiatus from fish in 2005. In 2010 or 2011, got my 65 high back from my son and started again.
Cycled the tank with fish and killed several, playing with Ammo-Lock, and "nitrifying bacteria in a bottle" (don't waste your time IMO).
The last 3 tanks I have set up with a fishless cycle, and it has worked beautifully! So, 46 year learning curve, and still learning!