Two very mellow and nice red wines are : Petite Sarah and Pinot Noir ! A little heavier but tasty red would me a good Merlot ! Not much on white wines , but I buy them for the wife and taste test them for her ! She also drinks a Cabernet Sauvignon once in a while too ! Yellow Tale is a good brand .
The thing with wine is you need to experiment and see what you like. Try a sweet wine like a Reisling or Zinfandel. Then try something more dry such as a Burgandy, Pinot Noir, or Cabernet Sauvignon. Most of the types I've mentioned are available in red or white so try both. A wine flight is a good way to sample a variety of wines for a little more than the price of a glass. If you can make a decision regarding dry or sweet, them you can tell the wine guy at a liquor store and he can make a recommendation. It's hard for me because I like both.
Try a lexia , moscato or a zibbo style of wine, moscato comes in either white or pink , these are sweet easy to drink also low in alcohol ( strong as a beer) and are great on a hot day. Most white wines are very dry and bitter, most reds are heavy and have a strong taste and smell basically strong anyway. In champagne try a imperial style ( not as strong as a brut style). Red wine a cabernet sauvignon blanc is a easy drinking red.