How to sharpen garden tools?

Use my garden tools often and would like to keep them sharp at all times. After use I ALWAYS wipe & spray with WD-40 spray but my blades are getting dull. Used files but don't seem to do the job that well.
Don't they sell a sharpener just for garden tools?
Wish my scissor & knife sharpener worked on garden tools. That would be soooo easy. Any ideas out there? Thx!
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