OOo comes with an extensive Help system. This is your first line of support for using OOo.
To display the full Help system, press F1 or select OpenOffice.org Help from the Help menu. In addition, you can choose whether to activate tooltips, extended tips, and the Help Agent (using Tools > Options > General).
If tooltips are enabled, place the mouse pointer over any of the icons to see a small box (“tooltip”) with a brief explanation of the icon’s function. For a more detailed explanation, select Help > What's This? and hold the pointer over the icon.