How to use multiple files efficiently using Vim editor

Many time we need to work with multiple files all together. If its windows system then we can use some GUI based editor to accomplish our task.

But what if you are on putty or have only CLI(Command Line Interface) as an option to edit your files. I prefer using vim editor. After doing some experiments and knowing some important commands, I though to share with you. So i have written few commands point wise which may be useful for you while editing multiple files using vim (not GVIM, although these commands are valid there too.) Tested on Linux box under vim v6.3 and vim v7.1