BASH reference for those who are "learning by doing"?

[Richard Owlett <rowlett@access.net>]

This started with be exploring "regular expressions".
I discovered some tutorials that were using Bash in their samples.
One {lost the reference at the moment} was almost a match for a real 
world problem I have.

But I've not used Bash in eons and have forgotten how to read a file 
into a single variable or a array variable.

I've downloaded "Bash Reference Manual"
  [https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html] 
for when I need fine grained details.
I've bookmarked the various links on
  [https://mywiki.wooledge.org/BashFAQ]
for quick reference.

I find neither to be search friendly.

Suggestions?

TIA