Is there a shortcut for the selector tool in Photoshop (the very fist tool in the tool bar, the one selected when opening Photoshop) ?
All tool shortcuts are listed if you choose Edit > Keyboard Shortcuts and choose Tools from the drop down.
The move tool's shortcut is v
For tools with sub-tools, you can right-click/control-click the tool for the pop out and the shortcut will be shown to the right of the tools.
Adding Brenden's comment to this answer so it's more complete:
If you have Tool Tips active in the preferences, you can also simply hover your mouse over any of the tools and the shortcut will appear as a tool tip.