Unity Tutorial requires in-store purchase??? Thread

I am going through the Unity learn tutorials, I am only on the second tutorial but it's asking me to purchase an asset, is this for real? I thought it was free? Where can I learn Unity for free? Tnx

ie:

• And the Fireballer - FPS Microgame Add-On part of the FPS Creator Bundle.
• Follow this mod to learn how to purchase and import the assets from the Add-On packs into your Microgame.
• Got it? Let’s rock!

'One Game Engine'- Licence, can`t prevail 'Another Game Engine'- Licence, but, seek A Strong Hobbyists, for evil-prevailing;