For Bite-size overviews check the demo center - 
https://www.databricks.com/resources/demos/library 

This youtube channel is great for more detailed oriented discussion around specific features .

https://www.youtube.com/@nextgenlakehouse

For more structured training you can take the course from databricks academy - 

Data Analyst Learning Path - https://partner-academy.databricks.com/learn/learning-plans/78/data-analyst-learning-plan?generated_...

Data Engineering Learning Path - https://partner-academy.databricks.com/learn/learning-plans/10/data-engineer-learning-plan?generated...