If we're going all in on the unix lore here, I'd suggest kernnighghan's book "Unix: A Memoir" as an optional add-on. Lots of good lore and history as to "how a

If we're going all in on the unix lore here, I'd suggest kernnighghan's book "Unix: A Memoir" as an optional add-on. Lots of good lore and history as to "how and why" things work in such a such way. Some commands in there you may not use or maybe heard of but not fully understand, such as grep, why the word grep, why the other types of grep such as egrep. And on the topic of grep, clearly a very popular command early on, so you also get a sense of "what were seen as the core commands commonly used initially" (and whether those may be useful to you today)