When anyone learns a new language you will of course be learning the primary language, for example whether you learn french in france or learn it from you home country, you will be simply learning Metropolitan French.
In France you will find that a lot of people use regional dialect or sometimes use Meridional French, which is mostly used in Occitania. This isn’t unusual for any country; the United Kingdom carries many dialects of the English language not to mention the many dialects spoken in the United States.
Outside of France alone there is Swiss French, Belgian French and Aostan French, which is a dialect, spoke in Italy. Canada adopts the French language along with English, its dialects are Québec French and Acadian French.
You will also find that French is spoken in the United States in certain states. In Louisiana they speak Louisiana French, which originates from the colonists of lower French Louisiana. French Louisiana itself is broken down into three dialects that are Colonial French, Acadian and Louisiana Creole French.
In Asia there is a dialect of French called Cambodian French. Cambodian French is derived from the French colonisation of Indochina. Inhabitants were taught French by the colonists and Cambodian French was moulded from Chinese, normally spoken by children of French Men who had Chinese wives.
In France alone there are many dialects, the reason for this goes back to the French Revolution when different regional languages were spoken to keep people uninformed. Such dialects include Breton which is spoken in Bretagne, its roots owe a lot to the Welsh language. In Southern France you will find people use the Occitan language, the Occitan language is a co-official language Catalonia, Spain.
Alsace not only adopts its own dialect, which is named Alsatian, but also its own accent. Alsatian is the most spoken language in France after Occitan. Although you will find it is the older generation who use it more than the younger generation.
France has attempted to have a unified language spoken but have not yet succeeded. Older generations are keen to pass on their dialect to the younger generation to keep their dialect alive. So if you were looking to learn French in order to compliment your visit to France it may be worth carrying out some research on the part of France you are visiting. Whilst most French will see you by in the tourist spots, the outskirts may require you to learn a little lingo.