The difference in text editors, their definition and features. using text edit and notepad to make websites. Third party options: notepad ++ is for windows computers, text wrangler is for mac computers, visual studio code, atoms and brackets are for windows, mac, Linux computers. subline is not free.
Linux: there is an introduction of Linux, some command lines. also there is a steps of how to opening terminals . the difference between shell and bash. shortcuts make it easy to work.
Basic navigations: how to move around the system . commands: * pwd (print work directory). * Ls (List the unhidden content). * cd (change directory). the difference between relative and absolute paths.
more about files: files obtain informations and extinctions. command ls-la: list all contents hidden and unhidden files.