Google Workspace
The best source for learning Google is Google.
Try out the training for Google Certification: These tutorials demonstrate a skill and offer quizzes so you can show how smart you are. Click on Get Started to begin. And then consider taking the Certification exam.
Google Educator's Learning Resources: Tutorials for all G Suite tools and how you can use them.
Google Workspace Learning Center: More general (non-educational focused) tutorials and training for all Google apps
But Google isn't the only source.
Eric Curts: Eric's web site CTRL+ALT+Achieve is an excellent and thoughtful resource. He regularly shares Google tool ideas and creativity.
Kasey Bell: Kasey's Shake Up Learning shares resources around teaching , but also offers courses and more at her site. (Fun fact about Kasey . . . she's been to Ehlenbach's Cheese Shop.)