I just created a simple project with 1 video file and 1 sound file.
I also cut both.
I'm trying to save that as a single video file (containing video and audio), which I can share with others.
How do I do that? I couldn't find how to... Thanks in advance!

You need to render your project. You should have a "render" icon in the main toolbar, or from the menus: "Project > Render". Then select a file format (mpeg-2 or mpeg-4 should be widely readable) and click "Render to File". That will create an mpeg file with your editing