Mathematics, after class 10, is written in terms of set theoretic terminologies, such as set, relation, function, binary operation, induction principle, etc. So, for smooth reading of the text, after class 10, one has to do extra effort in mastering a tiny course in set theory – the so-called Cantor’s paradise. Since a beginner is pressed for time, so there needs a book on set theory to be studied at the very start of the session, which can make a student well-conversant in set terminologies within no time and without struggling with the subject. This book “Basic Set Theory ( A Struggle-free Approach) has been written with this goal in mind. This book also eliminates many wrong conceptions prevailing in the minds of beginners regarding mathematics. All statements given in the book have been proved without any gap in the proofs - a rare feature among mathematics books. So the book contains no exercise. For the study of this book, there is no prerequisite.