Hey!
Integral is anti derivative..the formulae used are different from those used in differentiation..
U need to be more specific in saying wat u actually want to know..
Integration is divided into many parts.
for eg:integration of partials,integration by parts..
Be strong in the basic formulae first..
say integrals of trignometric functions,exponents.
and check out the problems in the NCERT text first..and an ideal guide to start of for the basics is probably RD Sharma.
I hope my piece of information was useful..
plz rate