Arch Linux is a lightweight, flexible distribution that lets you build your system exactly the way you want.
Starting from absolutely nothing, you will manually assemble your operating system piece by piece, like a digital IKEA chair that occasionally deletes your bootloader.
Other distros install things for you. Arch gives you a blinking cursor and says "good luck".
The Arch Wiki contains the knowledge of the entire Linux universe. Unfortunately you will read all of it.
The fastest package manager alive. Also the fastest way to accidentally remove your entire desktop environment.
User generated packages written by strangers on the internet. What could possibly go wrong?
Your system updates constantly. You are basically beta testing Linux.
If you open a GUI you will be judged.