Quick answers
How do I turn on quick cast in Dota 2?
Settings › Hotkeys › Advanced Hotkeys lets you set Quick Cast per ability or per item, or Quick Cast on Key Down for everything. Most players use quick cast for targeted abilities and normal cast for skill shots.
How do I use the courier?
F3 delivers items in the courier's inventory to you; F4 selects the courier so you can move it. Ctrl + F3 sends it to the base or fountain in some presets.
How do I ping in Dota 2?
Hold Left Alt and click the minimap or an ability; Alt + Ctrl + click gives a retreat ping. Alt-clicking your cooldowns tells the team when they are ready.
How do I move the camera?
Push the mouse to the screen edge, hold Mouse 3 to grip and drag, or use the arrow keys. Double-tap F1 to snap back to your hero.
Why are items on Z–N instead of numbers?
Valve reserves the number row for control groups. Most players rebind items to Space, Mouse 4, Mouse 5, D, F and G through the Hotkeys menu.