What makes Emacs different - when you look beyond the simple looking interface - is the possibility to make the packages / plugins work together not intended by the original authors by creating hooks that change the return value of the packages, and you can tie together the tools by writing Elisp scripts.
As to where to start: There are many young and ambitious hackers who are re-developing Emacs + Lisp for creating their custom dev / hacking / writing environment, and who create wonderful youtube videos. Magnar Sveen started doing this several years ago (emacsrock.com), then there are (among others) Protesilas Stavrou or the channel of "System Crafters".
When you prefer reading books: "An Introduction To Programming In Emacs Lisp" from Robert Chassell is excellent for learning the basics of Elisp. Mickey Petersens "Mastering Emacs" is excellent. Harley Hahn's Emacs Field Guide is recommended as well.
Also, r/emacs and r/orgmode are excellent communities.
Give yourself time. Don't hurry. Emacs is a tool that will keep your company in twenty years from now, when all the hyped tools are long gone (Textmate users moved to Sublime, then some of them to VS Code, who know's what's next?).
Great comment! But you were missing an s in this FQDN. Here's a working link: http://emacsrocks.com/
They could get a better experience with very minimal time of training or mastery, because the next tool they used was user friendly and better for them.
What’s wrong with that ? If new tools that are better and easy to use keep coming then that is something to celebrate.
When I tried to go outside of the agda-mode documentation, to try to learn emacs properly, I kinda struggled to find a reliable tutorial or introduction that got me started on how emacs and the culture/ecosystem works. (Maybe it was just me who got tripped up by my unfamiliarity with it.)
Do you have a good recommendation for a way or a book to get into emacs?
It does seem nice to run your editors in terminals, instead of the other way around.. haha