It can be mildly frustrating to find the flags in extremely large man pages. They tend to write them all over the place ('oh but this does this when you combine -r with -tr') so searches light up matches all over. This gets compounded when there are flags with two letters and you try to search for the first letter. (want -t but have to wade through 3000 mentions of -tr, -t1, -tz, -tmmm, -tt, -tttt, etc)
Maybe I just suck at searching man pages. Or I'm too impatient. Either way, https://explainshell.com/ has been a great website for explaining flags.