Navigation §
ma - mark a position with the label a (can be any letter)
'a - jump to mark a
'' - jump back to previous position (e.g. after jumping with gg)
42g - go to line 42
Searching §
-i - case insensitive search
/ /pattern/ - search
& /pattern/ - only show lines matching /pattern/ (like grep)
-G - turn off search highlighting
ESC-u - clear search highlighting
Misc §
F - enable tail -f-like behavior, Ctrl-C to break out of it
-N - show line numbers
-S - chop long lines, rather than wrapping
v - open file in $EDITOR