Confused on how to look for a particular man page

run

apropos

this wil give you a list of man pages that contain the above keyword in its description

for ex.

#apropos utmp
endutent [getutent]? (3)? – access utmp file entries
getutent???????????? (3)? – access utmp file entries
getutid [getutent]?? (3)? – access utmp file entries
getutline [getutent] (3)? – access utmp file entries
pututline [getutent] (3)? – access utmp file entries
setutent [getutent]? (3)? – access utmp file entries
utmp???????????????? (5)? – login records
utmpname [getutent]? (3)? – access utmp file entries
wtmp [utmp]????????? (5)? – login records

so you can now access the above listed man pages
these contain the keyword “utmp”