Mr Money Mustache: The granddaddy of early retirement blogs, Mr Money Mustache did it first and did it best. He has given me a ton of ideas over the years and has helped countless people, whether they want to retire early or simply improve their finances.
Rockstar Finance: This site is the biggest and best collection of personal finance blogs I know of. If you want to learn absolutely anything about personal finance, there is a blog listed here that can help you.
Doctor of Credit: This guy has forgotten more about credit cards (and bank accounts and deals of all kinds) than most people have ever known. I always refer people to this blog for anything credit card related whether it be churning, general rewards, score information, or just about anything else.