I was having trouble syncing my VSCode settings across different installations and it was caused, at least partially, by the fact that I forgot to add a comma between the first and second entries below. I thought I would share these, both to help others and to help future me. The first allows me to execute an open Python script by typing cmd and b. The next two allow me to uppercase or lowercase highlighted text by typing cmd, shift and u or l, depending on what I want to do. You can edit it within VSCode by clicking cmd, shift, p and searching for Shortcuts (JSON). The JSON is important because the other Keyboard Shortcuts is just a list of every keyboard shortcut built into VSCode. This code is stored in a file named keybindings.json in ~/Library/Application Support/Code/User on my Mac so you could probably edit it directly there, too.
VS Code - Visual Studio Code