iam having difficulty in solving the factorisation based questions , wish to help me out and tell an easy way to factorise any polynomial

To factorise polynomials, first of all we need to learn some basic algebraic identities.

Examples: a²-b²=(a+b)(a-b)

a³-b³=(a-b)(a²+ab+b²)

First try to learn all of quadratic and cubic identities given in your textbook thoroughly. 

Then go through the solved examples to understand the factorisation process and how to start a problem. 

Finally you can try to do some problems yourself and in case of difficulty, you can refer to hints or solutions given. 

Practising more questions will help you gain confidence in the topic. You can use topperlearning platform for more and more practice. Good luck.