Improper shutdown of system / Fragmentation Problems / Boot logs

[Bruce Hunter]

I am kinda new to FBSD, still kinda learning stuff. Anyway, when my
system boots i see all kinda fragmentation information. How do I correct
this? Any good reading material? Also, what should I do when I shutdown
my system incorrectly and boot up again? Last questions! I promise. Is
there a file that shows the data printed to screen durning boot?
Probably, a log file.

Thanks guys,
Bruce