"Linux Bible" by Christopher Negus is a really good introduction to the Unix computing world. Years just using Linux and reading a wiki, pale in comparison to simply reading a book from the library about it.
I liked Part II the most, since it relates to power-users. I'll definately read some books about bash and vim.
I did skip Parts VI & IV because I don't intend on running a Linux server soon.
Here's a link to the copy I read, but there is an 11th editon now.
https://www.wiley.com/Linux+Bible%2C+10th+Edition-p-9781119578956
