a)Salt is very lightly used because it aids in extracting flavor.
b) Herbs and spices are also used lightly because overuse might dominate the flavor of sticks.
c) They are usually put in a sachet (French for "bag") so it can be removed easily.
d) A "bouquet garni” is an assortment of fresh herbs and other
aromatic ingredients like leek, celery, bay leaf, parsley stems, peppercorns, clovers and garlic, and others.