Press Play, run your first script, and learn why test changes don't stick around.
This is the lesson where you make something happen. Up until now you've been arranging furniture. Now you're going to run code for the first time.
At the top of Studio there's a Play button (looks like a play icon). Press it.
Two things happen:
Walk around with WASD and jump with Space. This is what your game feels like to a player. When you're done, press Stop (the red stop icon).
Anything you change while the game is playing is thrown away when you press Stop. Change a part's color during a test, press Stop, and it's back to the old color. This is by design — it's how you experiment without wrecking your real work.
You change a part's color while Playtesting. What happens when you press Stop?
Scripts are how you make your game do things. A script is a text file with instructions, and Roblox reads them when the game starts.
That script comes with a sample line already in it. Delete it and type exactly this:
print("Hello from the Workspace")
Press Play again. When the game starts, that script runs, and at the bottom of your Studio screen — in the Output window — you should see:
Hello from the Workspace
print() doesn't draw anything on the screen. It's a note to yourself — it sends a line of text to the Output window so you can see that the code ran and what values it had at that moment. Developers use print constantly while building.