I think he argues that school is not a platform for free speech?
Brainstorming is very helpful because when you go over it fast you kind of get the general idea of what the story is about. You can can use the brainstorming process when writing a cover letter for a resume in many different ways. You can use this process to plot out what you will want to include in the resume, and what you believe your greatest accomplishments are. You'll want to include these things in a cover letter: your best accomplishments, different places you have worked, what your best skills are.
The conversation between Lady Macduff and her son is comedic because he provides a commentary on her life that is far beyond his years. His mother's surprise at his bluntness, when he turns the conversation around onto her (she says "what wilt thou do for a father?" and he replies "nay how will you do for a husband") she is surprised and the mood is lightened a bit from their worry and anger about Macduff's leaving. The boy is witty and bold, which makes his mother (and the audience) laugh.
