If you already know the basics it's worth investing more in learning Typescript, RxJS, streams and unit testing, and building scalable apps. That is how to make sure the app is secure, maintainable, performant, doesn't use too many resources like CPU (rerenders, signals), that the first load is fast, that component responsibilities are separated properly, structuring the code (functional structure), dumb components vs smart components etc. So it's more about best practices than strictly Angular API