What a lovely topic! I enjoyed reading through a few of these.
Some of my realizations were...
- Discovering that custom maps/user created maps had to be downloaded. For some reason, I thought that if you typed in the title of someone else's map in the map maker, you could instantly connect to that map and join other people. After looking up map-downloading tutorials, I discovered this not to be true.
- I didn't know what N/Z was for a while, but I heard everyone talking about it. Thankfully some lovely fluffs in-game helped me with directions.
- I didn't know how to use stealth mode/F3 until I started derping around with the functions one day.
- I didn't know you could sit down/change positions by toggling the Z and X buttons, and so I always had the actions/emote tab pulled up to change how my character moved. I later discovered that I could use the keyboard for most of this. I don't remember exactly when or how.
- I didn't know that you could view a user's bio by clicking on their name in the chat. I thought this was only possible by clicking on the user's character.