As always. Clear, practical, with just what you need of theory if you want to dig deeper (and you really should IMHO), but all the necessary code and bits if you are the kind of developper "I want to get my hands dirty ASAP", Alain Chautard articles are some of the best "Ng content😉" you can find on the internet.
Besides, Alain does not remember me, but I do remember him for being interviewed by him for his "Angular Training" expert certification,and, omitting the fact he's a nice and helpful person (ok,i can accept I'm biased, as a french dev being a little bit proud ,in a really silly way, for something that is not even a thing), I can tell you the guy knows its Angular on the top of his fingers, and can explain(or understand) the way things are made or structured in your code,of course, but it's also true for the nitty-gritty detail of the implémentation of any Ng functionality:if you are interested, he will take you further and help you going above the syntactical sugar the Ng-Team created(and thanks to them for this!), so you can fully understand what you write and how it relates to the ecosystem....
So thank you @Alain Chautard for all this free and high quality material you are bringing , for some ...years now, to the Ng-world.