Having taught myself javascript in the mid-late 1990s and brought down a few servers by simple mistakes (Not always my own) I swore myself off the language and

Having taught myself javascript in the mid-late 1990s and brought down a few servers by simple mistakes (Not always my own) I swore myself off the language and haven't looked back. Now I am looking to jump back in to do some app development and js seems the easiest way currently. I have looked at https://www.youtube.com/watch?v=hQVTIJBZook https://www.youtube.com/watch?v=hQVTIJBZook JavaScript the good parts 2009. There seems to be much better handle on JS so I also would be interested in "Best Practice" for modern JavaScript development.