https://www.gnu.org/prep/standards/html_node/GNU-Manuals.html#GNU-Manuals
"GNU Manuals
The preferred document format for the GNU system is the Texinfo formatting language. Every GNU package should (ideally) have documentation in Texinfo both for reference and for learners."
Info manuals usually have a philosophy section, an introduction, a tutorial and describe the relationship of the software with other softwares. Some manual pages nowadays also give examples, but in the 90s the main feature of a man page, as I experienced it as a newbie, was terseness with no regard for (dare I say a elitist disregard?) for learners like myself.