Forget everything you know about numbers. In fact, forget you even know what a number is. This is where real mathematics starts. Instead of math with numbers (which is mostly Arithmatic), we will now think about math with "things".

But it's better to start with some basic knowledge of numbers, their classification and their applications. Don't take the trouble of searching for the topics in google , I will help you!

• Number's Basics
• Common number sets

Well now, you are done with the basics and can get into the topic of Set Theory.

Hang on ! Are you asking WHY should I learn this topic? Here you can find ample examples of where Sets are used.

GRaph mathematics

Manifolds

Vector spaces

Equivalence relation

You can also read these Prerequisites: Basics of sets and their importance

Basic Idea about sets

Sets Introduction

These should give a clear idea about what exactly we are learning here. If you still find it a bit difficult to understand you have no reason to worry! You should watch these videos which should make it easier. This video makes you understand better the basics of sets and the pictorial representation makes to think and analyse better

This video makes you understand better the basics of set theory and the pictorial representation makes to think and analyse better

The exact meaning of grouping the well defined elements of a set can be understood by the video

A Venn diagram or set diagram is a diagram that shows all possible logical relations between a finite collection of sets. Venn diagrams were conceived around 1880 by John Venn. They are used to teach elementary sets, as well as illustrate simple set relationships in probability, logic, statistics,linguistics and computer science.

 Source: http://en.wikipedia.org/wiki/Venn_diagram