You can learn about Linux by reading the informational postings on Linux-related websites.
Here are a few good starting points:
- Linux Planet
- The Complete Beginner’s Guide to Linux
- BEGINNER’S GUIDE FOR LINUX — Start Learning Linux in Minutes
- Distro Watch
And here are a few good Linux primers:
- Linux System Administration Basics
- Introduction to Linux Concepts
- Find Files in Linux, Using the Command Line
- Linux Users and Groups
We recommend using Linux Mint - an easy to use distribution of Linux that allows you to migrate from Windows. Linux Mint publishes an excellent installation guide which can be downloaded here. (PDF) You can also visit the Getting Started page on the Linux Mint site.