What misconceptions did you have when you started playing?

I thought wings would grant infinite flight.

Then I was gifted with Red's Wings, and got proven so wrong.

 

I built a (dirt) wall to stop the corruption.

(Insert Donald Trump meme here)

And then it later got hit by a meteor.

 

I thought you could have a bunny pet back in the 1.1
Then I discovered the world restarts everytime you get out unlike Minecraft

 

I thought I could get away with looting the dungeon before skeletron.

And it is said that @PeanutMusic suffered through 3 heart attacks that day!

 

I throught that you must kill a dungeon guardian to acess dungeon.

 

I thought NPCs could only live in the forest.

When I saw someone with a house in the tundra and NPCs were living there, I tried moving my Tax Collector to the underworld and my Stylist to the underground. It works. Now I know the only places NPCs can't live in are the Corruption and the Crimson.