Ligero grows at the top of the tobacco plant, where sun and wind are hardest. The leaf is thicker, oilier, and higher in the compounds that read as strength. In a bunch it is usually placed toward the center so it does not dominate the burn on the outside.
Because it is dense, ligero needs more fermentation and more aging than seco or volado. Rush it and the cigar tastes green and sharp. Leave it out entirely and many full-bodied blends go hollow. The related page ligero leaf covers the leaf as a priming, not only as a slot in the bunch.
Ligero is not a flavor. It is a position on the stalk. Two ligero leaves from Estelí and the Cibao will not smoke the same. The word tells you where the leaf sat on the plant, not what the farm was.