You can share things with anyone, even if you're using Google drive with a normal Gmail (non-workspace) Google account. My drive are files you created / upload

You can share things with anyone, even if you're using Google drive with a normal Gmail (non-workspace) Google account. My drive are files you created / uploaded (and thus count against your space quota) and shared is where things go that have been shared with you by others, or public drive links that you've visited. Workspace is a shared space private to the company/organization workspace group.