I’ve started my first project in Unity (basic installed on PC standalone)
I’ve followed the essential, basic, and intermediate tutorials.
Save and closed the project (no confirmation command line?!?)
Re-open the project and all the game objects seem to be missing (not shown?)
Any advice/direction?
There’s a difference between projects and scenes. Project is the entire thing - all of the assets and settings that apply globally to that project. Scenes are the actual levels of your project - they contain assets from the Project and built-in stuff from Unity (lights and such).
Worth checking if there’s a scene asset in your project. Check the Project pane for one - it’ll have a little Unity icon on it. Double clicking it should load it up into the Scene view.
If there’s not one there, it sounds like you saved your project but not your scene 
Thanks,
I’ve reopened the project several times and now the objects show at start-up. I’ll save both going forward.
Best,
S