The following are four good sites related to SharePoint Online and PowerBI reports:
Embed a Report Web Part in SharePoint Online:
https://learn.microsoft.com/en-us/power-bi/collaborate-share/service-embed-report-spo
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
Create a Report Quickly from a SharePoint List or Library:
https://learn.microsoft.com/en-us/power-bi/create-reports/service-quick-create-sharepoint-list
Refresh a Dataset Stored on OneDrive or SharePoint Online:
https://learn.microsoft.com/en-us/power-bi/connect-data/refresh-desktop-file-onedrive
