I am writing an article on how to learn E2E Test Automation with my books, which will be ready next Monday.

If you asking specific about Appium + WinAppDriver, check out my book: https://leanpub.com/practical-desktop-app-test-automation-with-appium.

Also, some articles by my daughter:

https://courtneyzhan.medium.com/set-up-appium-2-to-automate-windows-apps-c39d4eef597e

https://courtneyzhan.medium.com/automate-windows-calculator-uwp-with-appium-2-56e2c7c8d58d

Moreover, a generic advice on self-learning E2E Test Automation: https://zhiminzhan.medium.com/advice-on-self-learning-test-automation-with-selenium-webdriver-846278328a99