Navigating using markers
Markers are used to create adhoc places to jump to in your buffer.
m and a character defines the name of the marker. For example,
m a defines a marker called
' and a character jumps to that marker, so
' a jumps to the marker called
Marker names are case-specific, so in theory you have have up to 52 markers.
In practice, its likely you will only use less than 7 (after which you may forget what those markers were for).