Publish the App
Since this is your first time you connect to this Business Central instance, Visual Studio Code will ask you to enter the username and password of a user with permission to publish extensions (it will remember it for future requests, though). Visual Studio Code also doesn't like when you click anywhere else when it asks you for those credentials, and will cancel the operation if you do 🥴. Thus, you'll need to remember the username (type it by hand) and copy/paste the password (click the User 1/User 2 name in ContainerHavn to place it on your clipboard) 💡.
With both the username and password prepared, hit CTRL+F5 to run the AL: Publish without debugging command 🚀. Once it's successfully published, it should open up the login page automatically. Log in and navigate to the Customer List:


Next steps
Congratulations, you've successfully created your first extension! 🥳
The logical next step, would be to save it somewhere safe, in case your computer dies.
Take it from someone who's been there — you don't want to lose a day's worth of
work to a BSoD...it hurts...
For this, we use Azure DevOps.