Veo estos, merecen la pena?
Refactoring
https://escuela.it/cursos/curso-refactoring
Pruebas unitarias - TDD
https://escuela.it/cursos/curso-avanzado-de-pruebas-unitarias
https://escuela.it/cursos/curso-desarrollo-pruebas-software
https://escuela.it/cursos/curso-tdd
https://pro.codely.com/library/testing-introduccion-y-buenas-practicas-44653/90916/about/
https://pro.codely.com/library/principios-solid-aplicados-36875/77070/about/
https://pro.codely.com/library/tdd-test-driven-development-179143/402368/about/
https://pro.codely.com/library/refactoring-de-code-smells-a-clean-code-bloaters-62290/176560/about/
https://pro.codely.com/library/refactoring-de-code-smells-a-clean-code-change-preventers-70287/210883/about/
DDD – Clean Architecture
https://www.udemy.com/course/aspnet-clean-architecture/
https://www.udemy.com/course/asp-net-clean-architecture-specification-graphql/
https://www.udemy.com/course/microservices-con-aspnet-core-y-docker-en-azure/