[lolikoisuru]

>Bash has a huge number of little shortcuts that are difficult to learn. [snip] it is difficult to Google for its meaning

Everything you could ever ask for is in the manual and also in the man page.

RTFM: https://www.gnu.org/software/bash/manual/bash.html

If you need a tutorial or a guide then try this one: http://mywiki.wooledge.org/FullBashGuide