OpenBox comes with a configurable start menu that you can reach by right-clicking on the desktop. You can also configure keybindings by editing your ~/.config/openbox/rc.xml file. I was really missing the window positioning keyboard short cuts that come with windows that allow you to maximize a window or split the screen with a window. So I added them to my rc.xml file, and then I added a few more that I wished windows would have come with. My screen resolution on that machine is 1200x1600, so the window heights and widths are based on that. Here's a snippet of my config file:
<!-- Keybindings for moving windows -->
<!-- In the key attribute, the W refers to the
windows/super key, C refers to the ctrl key and KP_# refers
to a number on the numpad. -->
<!-- Move and resize the window to fill the top left quarter of the screen -->
<keybind key="W-C-KP_7">
<action name="UnmaximizeFull" />
<action name="MoveResizeTo">
<height>600</height>
<width>800</widht>
<x>0</x>
<y>0</y>
</action>
</keybind>
<!-- Move and resize the window to fill the top right quarter of the screen --> <keybind key="W-C-KP_9">
<action name="UnmaximizeFull" />
<action name="MoveResizeTo">
<height>600</height>
<width>800</widht>
<x>800</x>
<y>0</y>
</action>
</keybind>
<!-- Move and resize the window to fill the bottom left quarter of the screen -->
<keybind key="W-C-KP_1">
<action name="UnmaximizeFull" />
<action name="MoveResizeTo">
<height>600</height>
<width>800</widht>
<x>0</x>
<y>600</y>
</action>
</keybind>
<!-- Move and resize the window to fill the bottom right quarter of the screen -->
<keybind key="W-C-KP_3">
<action name="UnmaximizeFull" />
<action name="MoveResizeTo">
<height>600</height>
<width>800</widht>
<x>800</x>
<y>600</y>
</action>
</keybind>
<!-- Move and resize the window to fill the top half of the screen -->
<keybind key="W-C-KP_8">
<action name="UnmaximizeFull" />
<action name="MaximizeHorz" />
<action name="MoveResizeTo">
<height>600</height>
<x>0</x>
<y>0</y>
</action>
</keybind>
<!-- Move and resize the window to fill the right half of the screen -->
<keybind key="W-C-KP_6">
<action name="UnmaximizeFull" />
<action name="MaximizeVert" />
<action name="MoveResizeTo">
<width>800</width>
<x>800</x>
<y>0</y>
</action>
</keybind>
<!-- Move and resize the window to fill the bottom half of the screen -->
<keybind key="W-C-KP_2">
<action name="UnmaximizeFull" />
<action name="MaximizeHorz" />
<action name="MoveResizeTo">
<height>600</height>
<x>0</x>
<y>600</y>
</action>
</keybind>
<!-- Move and resize the window to fill the right half of the screen -->
<keybind key="W-C-KP_4">
<action name="UnmaximizeFull" />
<action name="MaximizeVert" />
<action name="MoveResizeTo">
<width>800</width>
<x>0</x>
<y>0</y>
</action>
</keybind>
<!-- Resize and center the window -->
<keybind key="W-C-KP_5">
<action name="UnmaximizeFull" />
<action name="MoveResizeTo">
<height>600</height>
<width>800</widht>
<x>400</x>
<y>300</y>
</action>
</keybind>