003 https-angular.io-guide-attribute-directives
https://angular.io/guide/attribute-directives

003 https-getbootstrap.com-docs-5.0-getting-started-introduction-
https://getbootstrap.com/docs/5.0/getting-started/introduction/

010 Color-Hexadecimal-aleatorio
https://gist.github.com/Klerith/a0d7f1daa5a80d35d620b4cc56d33774