C++ && SFML game class [duplicate]

Im making c++ && sfml game for my teacher.

I need to make game class naturaly I make constructor and destructor, but I cant figure out what methods should game class contain.

curently it has these : init() – init all variables and other stuff

(before I moved to c++ I was making games in HTML,JS but I never used OOP there. So I have no exp. doing games like this)