What's the best bike to get for cycling? Heck if I know. I'm just a beginner. I suggest that you start with any old bike you can get your hands on. Really. If you've got one in your garage, or you know someone who has one that's not being used, just spray some WD-40 on the rusty parts, inflate the tire and make sure there are no leaks, and give it a go. You do not need anything fancy to start with.
The really nice bikes are optimal, of course, but they are also well over $ 1,000 (some are well over twice that), and they are not necessary to get into the sport and enjoy it. Once you get into it, and are sure you'll be doing it for the long term, look into a better bike.
The nice road bikes are lighter, with strong frames, thin tires (for less friction), with a whole host of other nice features to make riding fast and easy. However, I use an old mountain bike, and I still love riding.
What's most important is that the bike fits you. The bike should fit your height (from ground to crotch), as well as the distance from the seat to the handle. I'm not an expert at this - it's best to go to a good bike shop to get fitted.