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Bonus: The wtf command can help you with acronyms and it works as whatis if no acronym on it's database is found, but what you are searching is part of the man database. On Debian this command is part of the bsdgames package. Examples:

nwildner@host:~$ wtf rtfm
RTFM: read the fine/fucking manual
nwildner@host:~$ wtf afaik
AFAIK: as far as I know
nwildner@host:~$ wtf afak
Gee...  I don't know what afak means...
nwildner@host:~$ wtf tcp
tcp: tcp (7)              - TCP protocol.
nwildner@host:~$ wtf systemd
systemd: systemd (1)          - systemd system and service manager

Or, the help() funcion inside python shell if you want to read more details of some object:

nwildner@host:~$ python3.6
Python 3.6.7 (default, Oct 21 2018, 08:08:16)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> help(round)

Help on built-in function round in module builtins:

round(...)
    round(number[, ndigits]) -> number

    Round a number to a given precision in decimal digits (default 0 digits).
    This returns an int when called with one argument, otherwise the
    same type as the number. ndigits may be negative.

#The manpager

When you open a manpage using the man command, the output will be displayed/rendered by the less or more commands, or any other command that will be set as your pager(manpager).

If you are using Linux you are probably served with your man infrastructure already configured to use /usr/bin/less -is (unless you installed some minimal distro) as man(1), explain on it's Options section:

-P pager
Specify which pager to use. This option overrides the MANPAGER environment variable, 
which in turn overrides the PAGER variable. By default, man uses /usr/bin/less -is.

On FreeBSD and OpenBSD is just a matter of editing the MANPAGER environment variable since they will mostly use more, and some features like search and text highlight could be missing.

There is a good answer to the question of what differences more, less and most have here(never used most). The ability to scroll backwards and scroll forward by page with Space or both ways by line with ↓ or ↑(also, using vi bindings j and k) is essential while browsing manpages. Press h while using less to see the summary of commands available.

And that's why I suggest you to use less as your man pager. less have some essential features that will be used during this answer.

#Pager

When you open a manpage, it will be displayed by the less or more commands. I suggest you switch to less whenever possible. If you are using Linux you are probably served with your man infrastructure already configured to use /usr/bin/less -is (unless you installed some minimal distro) as man(1), explain on it's Options section:

-P pager
Specify which pager to use. This option overrides the MANPAGER environment variable, 
which in turn overrides the PAGER variable. By default, man uses /usr/bin/less -is.

There is a good answer to the question of what differences more, less and mosthave here(never used the last one). The ability to scroll backwards and scroll forward by page with Space or both ways by line with ↓ or ↑(also, using vi bindings j and k) is essential while browsing manpages. Press h while using less to see the summary of commands available.