Going into Medicare at the start can feel like a big puzzle. With key dates, fees, lots of parts, & updates, it's easy to feel lost & make big mistakes. If you're near age 65 or help a loved one sign up, know the main bits to save time, cash, & stress. In this complete guide to Medicare 101, we'll lay out the plan & help you dodge the main sign-up slips.  What Is Medicare?...