There are many wonderful curated resources the WebdriverIO community has put together.
- The Web App Testing Guidebook
Covers everything you need to know to get off the ground with UI testing. Examples are built using real-world scenarios, showing how you would actually write your tests. It's a step-by-step guide on how to effectively write UI test automation for the real world.
- UI Automation with WebdriverIO by Julia Pottinger
- Automated Software Testing with WebdriverIO by Kaniel Outis
- WebdriverIO - Tutorial for beginners by Automation Bro
- Learn WebdriverIO Course by Kevin Lamping
- WebdriverIO : NETWORK LOGS by Seventeenth Sep
- My favourite features of WebdriverIO by Julia Pottinger
- The Nuts and Bolts of WebdriverIO by Christian Bromann
- Using WebdriverIO with Data Provider by Kumar Vikram
- Scale Your Automated Testing with BrowserStack and WebdriverIO by Kevin Lamping
- WebdriverIO - Bootstrap your test suite in mins by Shweta Varma