What's the difference between the triple alliance/triple entente and the central powers/allied powers?

The Triple Entente consists of France, Great Britain, and Russia. The Triple Alliance  consists of Germany, Serbia, and Austria-Hungary. Hope that helped.

Britain, France, and Russia  were  Triple alliance/Triple Entente
Germany, Austria-Hungary, and Italy were  the Central Powers/Allied powers.
Britain, France, and Russia  were  Triple alliance/Triple Entente
fought against a group of European countries known as the Central Powers 

Which reforms did gandhi initially promote when he joined the national congress