Welcome to LQ. This place has helped me immensely over the years.
Here are some resources that I've found helpful.
About dot com's intro to Linux. It's oriented to Ubuntu, but the information is solid.
The
Slackbook. It's Slackware-oriented, so it's very good on basics, such as permissions, file structure, and the like.
Garrels's
Introduction to Linux. It is extremely detailed and very thorough. I have a printed-out copy on my bookshelf that I read all the way through.