What the heck? How come there are two of them? Which do I go with?
WordPress is an open source (FREE) software to make websites, beyond that it is a content management system (expanded capabilities from just html/old school websites). It is great for website development or for blogging, or as I recommend a website that has both.
WordPress.org is the WP community’s website. You can download WP from there but don’t. When you set up a domain on any of the hosting sites I recommend: Green Geeks, Blue Host, etc. you will be able to install the WordPress software right from host account.
WordPress.org is THE place to go for information about WP, forums, great links, galleries of themes and details about themes from people that have used them, details about widgets and plugin (more about them in another post).
WordPress.com is a privately owned website. If you just want a free blogging or to try out WP that would be an easy way to do it. They have free websites that included “your name”.wordpress.com in the URL. But there are a number of limitations in using their site. And they Are trying to sell you products.