I'm new in this and I'm working on the gingerbread man tutorial. My problem is that sometimes I don't find some buttons and I would like to know if there is a tool for finding them.
If it's a keyboard shortcut you are looking for, you can try searching for the tool in CtrlAltU> User preferences > Input:
As for external resources, you can try the wiki, but beware that some parts are incomplete/out of date.
Another external resource which works well is google, usually searching for something like "blender <function name>" will get you results.
However, if all else fails you can always ask here ;)