Olá Walisoul, segue alguns links de temas que estou aprofudando no momento.

• Curso de Angular 2 da Loiane Groner https://www.youtube.com/watch?v=tPOMG0D57S0

• Testes com Angular 2+ (em inglês) https://angular.io/guide/testing

• Entendendo rxjs observables com Angular https://tableless.com.br/entendendo-rxjs-observable-com-angular/

• How to Configure ESLint and Prettier in an Angular Application https://javascript.plainenglish.io/how-to-configure-eslint-and-prettier-on-angular-application-87dbd767369c

• Good testing practices with Angular Testing Library https://timdeschryver.dev/blog/good-testing-practices-with-angular-testing-library

• Angular Architecture - Smart Components vs Presentational Components https://blog.angular-university.io/angular-2-smart-components-vs-presentation-components-whats-the-difference-when-to-use-each-and-why/