The following are some useful sites for SharePoint & Power BI aspects:
Create a Power BI Dataset Directly from a SharePoint List:
https://learn.microsoft.com/en-us/power-bi/connect-data/create-dataset-sharepoint-online-list
Create a Report on a SharePoint List in Power BI Desktop:
https://learn.microsoft.com/en-us/power-bi/connect-data/desktop-sharepoint-online-list
Use the Power BI Web Part:
Power BI Documentation:
https://learn.microsoft.com/en-us/power-bi/
Power BI Support:
https://powerbi.microsoft.com/en-us/support/
Share a Power BI Dashboard that Links to an Excel File in OneDrive:
Publish to Web from Power BI:
https://learn.microsoft.com/en-us/power-bi/collaborate-share/service-publish-to-web
SharePoint Documentation: