In Emacs buzzwordology, "electric" means roughly "computer-assisted". When you hit TAB in Emacs, it will automatically indent your cursor to the proper column, depending on the current major mode (programming language, as determined by Emacs) and indent style. If you do this at the beginning of a line (anywhere before the first non-whitespace character), it will move the
whole line to the appropriate position. It's exceedingly convenient, and beats the pants off any IDE that isn't Emacs or something attempting to closely emulate Emacs behavior.
As for learning resources, one of the most comprehensive and convenient ones out there is -- Emacs itself! There are reasons why they call it a "self-documenting editor". Boot up the editor, and type C-h t (that is type Control+h, then type t), and you will be taken to a tutorial which you can work through to give you a feel for Emacs basics. While using the editor itself you have a number of help resources available: C-h k followed by another keystroke will tell you what that keystroke does. Type C-h w and enter a function name, and Emacs will show you the keystroke for that function (if any). C-h f and C-h v followed by a function or variable name, respectively, will bring up detailed documentation about that function or variable. C-h i brings up info, which has online user manuals for Emacs and other GNU software (depending on your distribution and installed packages). And so forth.
Outside Emacs itself, there is the venerable Emacs Wiki: https://www.emacswiki.org -- which covers Emacs itself as well as various third-party extensions and packages for the editor, and contains additional links to other resources.
One more thing: If you're serious about learning Emacs, I recommend that you really commit to spending all of your coding time inside it. Don't wuss out and go back to your nice safe comfortable editor when the going gets tough. The best way to learn, when it comes to a program like this, is by doing. If you do wuss out, that's okay too -- not everybody is willing to put in the time it takes to reap the rewards Emacs has to offer, and if they're making good money with the tools they have there's no shame in that.