How to learn linux through online resources

If you want a easiest linux distribution you should go with Ubuntu. In terms of online resources for ubuntu you can download its e-book on seevral torrent sites and/or on www.pdfchm.com. You can also checkout howtoforge.com for further tutorials on several linux distros including the latest version of ubuntu.

for job purpose i think red hat is the best... follow this link for online tutorial : http://www.softlookup.com/tutorial/redhat/index.asp