Early on in the New Year we're all likely still catching up with things that we put aside during the holidays. One of those things might have been a review of what's been added and improved in ArcGIS Online, a good review exercise to ensure you getting the most out of new features and capabilities.
The recently published 2025 ArcGIS Online year in review covers all the updates during last year, and provides quick links to get details and a list of all blog articles covering each update.

As you begin working this New Year, it's worth a look to see if you've overlooked something that might be useful in your workflows.