>Do I hit enter after typing md5sum ~/Desktop/lala.iso?
Yes. Except use trisquel-whatever-version.iso instead of lala
>Do I type in -/Des and hit the tab after pressing Enter following the
previous command or do it all on the same line?
>What exactly does it mean to complete paths?
I mean you don't have to write all the letters in that md5blabla command.
Just type a few letters and hit tab and the shell will complete the path for
you. So you write ~/Des and then hit TAB and bam - the system fill write
esktop for you. Then type a few letters of the name of the .iso and hit TAB
again and the same magic happens. Or you could just type the whole thing.
(watch out for typ0s in that case)
https://en.wikipedia.org/wiki/Tab_completion
