The error message:
failed to bind port 0.0.0.0:80/tcp: Error starting userland proxy: listen tcp4 0.0.0.0:80: bind: address already in use
means that port 80 on your machine is already being used by another process. Laravel Sail tries to bind to port 80 by default, but it can't because something else is using it (often another web server like Apache or nginx).
How to solve:
1. Find and Stop the Process Using Port 80
On Linux/macOS:
Find the process:
sudo lsof -i :80
Stop the process (replace <PID> with the actual process ID):
sudo kill <PID>
On Windows:
Find the process:
netstat -ano | findstr :80
Then stop it in Task Manager or with:
taskkill /PID <PID> /F
2. Or, Change the Port Sail Uses
If you don't want to stop the other process, you can run Sail on a different port.
Edit your .env file and change the APP_PORT variable to something else, like 8080:
APP_PORT=8080
Then, bring Sail up again:
./vendor/bin/sail up
Now, access your application at http://localhost:8080.
Summary:
Either free up port 80, or change the port Sail uses by setting APP_PORT in your .env file. The second option is usually easier for beginners.
Let me know if you need more help!