I love a good red wine. It is made from dark-colored grapes.
Does that mean that white wine is made from light colored grapes? 
Yes, it is made mainly from "white" grapes, which are typically green and yellow.
That makes sense. Do you know anything else about the winemaking process? Do people really stomp on grapes with their feet to get juice out?
In the past, pressing the grapes was done by feet. However, most wineries use a crusher instead.
That's probably a lot more effective. My favorite wine varietal is rose. Is that made from red or white grapes?
Rosé
A rosé (from French "rosé"; also known as "rosado" in Portuguese and Spanish-speaking countries and "rosato" in Italy) is a type of wine that incorporates some of the color from the grape skins, but not enough to qualify it as a red wine. It may be the oldest known type of wine, as it is the most straightforward to make with the skin contact method. The pink color can range from a pale "onion-skin" orange to a vivid near
teinturier varieties, which actually have red flesh and produce red juice.
Variants White wine.
Fermentation of the non-colored grape pulp produces white wine. The grapes from which white wine is produced are typically green or yellow. Some varieties are well-known, such as the Chardonnay, Sauvignon, and Riesling. Other white wines are blended from multiple varieties; Tokay, Sherry, and Sauternes are examples of these. Dark-skinned grapes may be used to produce white wine if the wine-maker is careful not