what is difference between ,sometimes occasionally and seldom.. beacause all meaning are same?

No buddy, they are not same. They are different in meaning. Sometimes = not always, on certain occasions. Ex..I sometimes play cricket. Occasionally = now and then, once in a while. Ex..My friend occasionally takes alcohol. (There is a subtle difference between them, but they can be used interchangeably.) Seldom = infrequently, rarely. Ex..I seldom watch movies.