I don’t see anyone mentions htop. So, I will:) Just works, could be installed in any distro. Much more friendly than top but isn’t bloated with features as some other alternatives are.

If you’d map it to just f it’s even more handy

A really simple one but surprisingly useful is cal

Terminator isn’t supported anymore as far as I remember. A good substitution for it is Tilix. I’d been using the latter for a while but recently I switched to the new default terminal in Fedora (it had weird name that I unable to remember) and Tilling Shell extension for Gnome.

First of all, LFS is a book. It is intended for learning. The working Linux system you’re ending up with after finishing reading the book is just a result of you performing practicing exercises while reading the book.