To get started with OpenRefine and the GOKb extension, visit our tutorial.
The Open Refine wiki (https://github.com/OpenRefine/OpenRefine/wiki) contains basic information on using Refine, including common 'recipes' for data transformation.
The Open Refine mailing list is active and can often help with advice on how to best use Refine to solve specific problems: http://groups.google.com/d/forum/openrefine
The 'How-Tos' below deal with specific tasks/transformations relevant to GOKb.