https://linux.101hacks.com/cd-command/dirs-pushd-popd/
https://www.tecmint.com/pushd-and-popd-linux-filesystem-navigation/
https://www.tecmint.com/bd-quickly-go-back-to-a-linux-parent-directory/
https://www.tecmint.com/autojump-a-quickest-way-to-navigate-linux-filesystem/