Watch each command run in a real-looking terminal, see what every part of it means, then try it yourself with practice tasks. From ls to kubectl.
The first three commands on any server: where am I, what's here, and how full is the disk.
Read files, page through logs, follow them live, edit in vim or nano, and compare versions.
catPrint and concatenate filesBeginnertacPrint a file with the lines in reverse orderBeginnerheadShow the first lines or bytes of a fileBeginnertailShow the last lines of a file and follow it liveBeginnermorePage through text one screen at a timeBeginnerlessBrowse files and output: scroll, search, filter, followBeginnervimEdit files on any server with vimIntermediatenanoEdit files with nano, the beginner-friendly editorBeginnerwcCount lines, words and bytesBeginnerdiffCompare files and directories line by lineIntermediate