What have I learnt in chapter 2.1 ?

I have learnt more about expanding in algebra than last year.Besides that i have better understanding in algebra too.I also know that the number's sign in the bracket have to change too.

What are the difficulties ?

I will get confuse in the signs will the question involves a lot of numbers and alphabets.I does not know where to add in additional brackets too.

What I want to know more ?

I would like to know if there is a faster way to solve the questions but not confuse.