With a few special tools and the best sandpaper for wood you can smooth wood easily and quickly with first-class results. Often even better than with a power sander.
Special tools and high-quality sandpaper produce great results with less effort
Sanding by Hand
Tips for Sanding Basics - FineWoodworking
7 Pro-Approved Tips for How to Sand Woodwork by Hand Woodworking, Staining wood, Chair woodworking plans
Fandeli, Multi-Purpose Sandpaper, 100 Grit, 25 Sheets of 9'' x 11
7 Pro-Approved Tips for How to Sand Woodwork by Hand
Keys to Successful Hand-Sanding
HAND SANDING: how to use sandpaper correctly (by folding it differently)
Warner Manufacturing Tool 34436 Sanding Block, Carded, in a Cut Carton
7 Pro-Approved Tips for How to Sand Woodwork by Hand (DIY)
11 Wood Sanding Tips Tricks and Hacks to Save Time and Money - Empire Abrasives
Sanding a Teak Deck — Teakdecking Systems