How does Hermione help Harry in all the books?

I have to write an essay in the HP series(i couldnt finish it in time) and i need help on how Hermione helped Harry throughout the serier i have an idea for the first 3 books but now i need help for the next 4, please give me ideas on how hermione helped Harry from the goblet of fire, order of Phoenix, half blood prince, and deathly hallows.