You’ll soon find out some wizarding families are much better than others, Potter. You don’t want to go making friends with the wrong sort. I can help you there.” He held out his hand to shake Harry’s, but Harry didn’t take it. “I think I can tell who the wrong sort are for myself, thanks,” he said coolly.
J. K. RowlingAnd they'd [the Death Eaters] love to have me," said Harry sarcastically. "We'd be best pals if they didn't keep trying to do me in.
J. K. RowlingRead as much as you possibly can. Nothing will help you as much as reading and you'll go through a phase where you will imitate your favorite writers and that's fine because that's a learning experience too.
J. K. Rowling