MassGIS
MassGIS Data Layers
MassMapper
MassGIS Data Hub
UConn Magic
CT GIS Data
ArcGIS Pro Quick-Start Tutorials by Esri (YouTube Playlist)
ArcGIS Pro Video Tutorials (YouTube Playlist)
Adam Corcoran GIS Express Tutorials (YouTube Channel)
ArcGIS Pro Full Beginner's Course (Video)
ArcGIS Pro Quick-Start Tutorials (Tutorials)
Michael Minn Tutorials
GIS Tutorial for ArcGIS Pro 3.4
Getting to Know ArcGIS Pro 3.2
Top 20 Essential Skills for ArcGIS Pro
Top 20 Essential Skills for ArcGIS Online
ArcGIS Pro 3.x Cookbook (2nd Edition)
GIS Commons (free)
ArcGIS Online
ArcGIS Living Atlas of the World
Learn ArcGIS
Esri Academy
15 tips for cartographers in ArcGIS Pro
Primary Design Principles for Cartography (Aileen Buckley)