If you have access to the content that partner companies provide, that would be the ideal way to start using Databricks in all aspects and specialize in the area you want, such as machine learning or data engineering. If you don't, there are many free resources available on YouTube, like this playlist: https://youtube.com/playlist?list=PLxy0DxWEupiNjGSv1hzRFBXgSzV-bZu94&si=0P1uac9F74ZuR4wC.