The development environment

I would like to know how to set up the Omniverse environment if I use Kit to secondary develop the extension I want, or if I want to access the source code of an extension? Many packages are missing when I open the create directory with vscode.

I find the easiest way to browse extension source code is through the Extension Manager. You can open any extension in VS Code by selecting the extension and clicking on the button with the VS Code icon (red arrow). If you want to start a new extension, you can click the green “+” button (green arrow).