Integration is a way of adding slices to find the whole. Integration can be used to find areas, volumes, central points and many useful things. But it is easiest to start with finding the area under the curve of a function like this: What is the area under y = f(x) ?
You should start with basics first. Learn all the formulas. Integration is basically opposite of differentiation. Start with simple questions and basic methods like substitution, partial fraction etc. and practice as much as you can. Don't start with definite integrals, first do indefinite integrals and you will understand really better if you are good in differentiation.