Welcome to Databricks community.
You should head to https://www.databricks.com/learn and practice them here on the Free edition https://www.databricks.com/learn/free-edition
Start with the free, short fundamentals courses to build a strong base: take Databricks Fundamentals and then Lakehouse Fundamentals to earn shareable badges. These are designed for absolute beginners.
Databricks Training & Certification programs (catalog, badges, ILT): https://www.databricks.com/learn/training/home
Our documentations are great! Checkout getting started guides - https://community.databricks.com/t5/get-started-resources/ct-p/GetStartedResources
If you are looking for something specific, please do let me know and I can guide further.
Thanks!