For storing wooden handles (wooden blanks) made of ash, birch, beech, etc., I remove the bark (carefully), quarter (split) them, remove the heartwood, and seal both end grain sides. Then I store them outdoors (in a dry and shady place). After 2-3 years, I then process them further into tool handles. Always pay attention to the natural grain pattern as much as possible (don't carve too much, follow the natural grain split pattern). Of course, trees (for handles) are always felled during the sap-free period in winter. I also pay attention to the lunar calendar sometimes.