More than worrying about what to read next, I'd worry about fully understanding how a command is used in practice. It's one thing to read (say) the xargs man pa

More than worrying about what to read next, I'd worry about fully understanding how a command is used in practice. It's one thing to read (say) the xargs man page and another thing to have a sense where it'll come in handy. Similarly, some commands have dozens of options, while you only need to understand a few for most of the common uses. So I'd recommend doing a bit more than reading the man page. The best suggestion I can think of is to also read the top 3-5 questions on StackExchange that mention that command. PS: after reading the man page for man itself, I recommend 'man apropos'. :)