[felixschl]

Read the manual front to back and install shellcheck. Doing both things has paid off for me a thousand times over. The rest is practice. Complete the bash exercises on Hackerrank. Bash is fantastic in it's domain but it does require serious study in my experience

[jdreaver]

I can second the shellcheck recommendation. Shellcheck makes great recommendations, and every suggestion has a corresponding code you can google to get to a detailed explanation of why that is considered a warning or error. Hell, even if I just considered the times I forgot to put quotes around a variable and got warned by shellcheck I would be happy that I use it.

[_lce0]

http://www.shellcheck.net/

https://packagecontrol.io/packages/SublimeLinter-shellcheck