GIS Geography is a good resource: https://gisgeography.com/learn-gis/
As others have said, ESRI has good training on their website(much of it free) and the publish a lot of content to YouTube.
Coursera has a Geographical Information Systems (GIS) specialization course taught by UC Davis or a GIS, Mapping, and Spatial Analysis specialization course taught by University of Toronto.
As an online component of their GIS book "Mastering ArcGIS Pro", McGraw Hill has some online tutorial videos here. (The audio quality isn't the best, but it is great to see the instructor go through the motions for each action).
MIT OPEN Courseware has some GIS Tutorials for both ArcGIS and QGIS here.
There are a number of classes on Udemy.
Depending on what your end goals are, there are also some short specialized classes in geospatial analysis offered by the National Wildfire Coordinating Group (here - wildfire analysis), the Federal Emergency Management Agency (here - GIS for disasters), the US Census Bureau (mostly OpenStreetMap and QGIS, but the dataset review is good here)