Starting Learning Agile...

Some thoughts on starting learning Agile/Scrum (i.e. introductory readings):

If you like the online tutorials format:
http://www.tutorialspoint.com/agile/

If you like "the source" read the full "Scrum Official Guide" by the authors. It is the original (<20 p.) doc, and it is free:
http://www.scrumguides.org/docs/scrumguide/v1/scrum-guide-us.pdf (2013 version)

If you like a summary, use the for dummies series, or the special IBM series, which you can get by registering to IBM (<80 p.). Google says:
http://www.cise.ufl.edu/~manuel/Agile-for-Dummies
https://cs.anu.edu.au/courses/comp3120/public_docs/AgileForDummies.pdf

If you like the handbook format (<40 p.):
http://agilehandbook.com/agile-handbook.pdf

If you like the cheat sheet format, the "for dummies" series typically have them published online:
http://www.dummies.com/careers/project-management/agile-project-management-for-dummies-cheat-sheet/