The different features of the Startup page.

This tab is very important, as it has quite a lot of important information and features.

Here, you can see the command that is used to start your server. You can link a github repository to your server, change the main file that is launched on start, the name of the requirements file to download packages, or download packages manually.

The name of the text field for the additional packages might change in between languages, "additional python packages", "additional nodejs modules", they're always similar tho!