TITLE: Road map to learn about $\mathrm{Out}{F_n}$
QUESTION [10 upvotes]: I'm a last year undergraduate student and I have taken a graduate course in geometric group theory.
I'd like to start reading some more advanced stuff in geometric group theory and in particular about automorphisms of free groups. (In specific I'm interested in $\mathrm{Out}(F_n)$.)
Could you please suggest me material (books, notes, papers)? I've started studying "The topology of $\mathrm{Out}(F_n)$" by Mladen Bestvina. Are there any similar works (or more introductory ones)?
Thanks! (If this is not the place for such a question please let me know)

REPLY [4 votes]: I'm obliged to add "The topology, geometry, and dynamics of free groups. Part I: Outer space, fold paths, and the Nielsen/Whitehead problems" by Lee Mosher which I find very helpful (looking forward to Parts II & III).