How to tell what's good French wine?

I love wine. A coworker, who retired from a winery, told me when buying Italian wine it's best to purchase bottles with the DOCG "Denominazione di origine controllata" label attached. Truly, I have enjoyed all the wine I've drank which came from those bottles. I just left a Wine Tasting Room... show more I love wine. A coworker, who retired from a winery, told me when buying Italian wine it's best to purchase bottles with the DOCG "Denominazione di origine controllata" label attached. Truly, I have enjoyed all the wine I've drank which came from those bottles. I just left a Wine Tasting Room where I sampled wine that I thought was lousy -- and way overpriced. Over the years, I've had a few bottles of French wine which I enjoyed, and I'm wondering if there is a type of labeling system which designates good French wine like the Italian DOCG indicator? If not, how best can I ensure I'm buying good quality French wine?
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