Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
You've built a linux desktop. You've mounted the learning curve to configure the hardware (or paid someone else to do so) and you are able to do your own work on the machine. You've discovered that if you can point and click you can run a modern linux OS on your desktop.
But how is it you will ever relate to the rest of the world? What do you do with the MS attachments people send you? How do you enjoy the music distributed in formats for a Windows World?
First, for the impatient working in a gui environment, here is a quick mapping from the proprietary tools you may have used in the past to the tools now potentially available on your new linux installation.