Hello,

It is the 1st chapter in +2 2nd year. You can ask your teacher to help you explain the concepts. There are many rules in it which will help you alot when you practice.

This chapter has high contribution for chapter like differentiation and integration. If  you join any science degree then you will use all these concepts there. So from now learn it perfectly and practice lots of questions so that you won't forget it. These chapters also contribute questions to entrance exams and holds high weightage too.

So practice all these. Ask your mathematics teacher to help you.

Hope it helps!