A little foreword on learning vim:
You have two modes, command mode and edit mode. In command mode, you issue these commands by simplying typing them. To get into command mode no matter where you are, you'd press ESC. There are several keys to start directly editing the text, those are the buffer editing modes. There are numerous ways to traverse the text in a file, like the arrow keys but more efficiently. Those are the cursor moving commands. There are many commands to actually modify the text in a buffer by means of cutting, and pasting. Those are buffer manipulation commands. There are also "long" commands that simply wouldn't fit because there aren't enough keys on the keyboard. These commands are also used typically with vim extentions (www.vim.org). Long commands are done by going into command mode (ESC) and then typing :. Once you've typed : you'll notice a mini-prompt appear in the bottom left of the screen, and this is your long command buffer.