Here are some websites and Youtube channels that are helpful.
Official Microsoft Excel Video Training
https://support.microsoft.com/en-us/office/excel-video-training-9bc05390-e94c-46af-a5b3-d7c22f6990bb
Mike Girvin
#Thousands of videos on Excel
Bill Jelen
#Excel and Formula
Leila Gharani
#Excel, Formula, and Tips on other MS office apps
Mynda Treacy
#Dashboards, Power BI, Excel
Jon Acampora
#Excel
ExcelJet
#Excel formula
Oz du Soleil
#Power Query, Excel
Alan Murray
#VBA and Excel
Dinesh Kumar Takyar
#Scenario/Question Based Video, VBA
Chandoo
#Power BI, Dashboards, Excel
Wise Owl
#VBA (Awesome training for VBA)
Paul Kelly
#VBA, Optimization of Codes
Lon Pamai
#VBA