Actual list of updated features in Microsoft 365

As a trainer, it is infuriating that there is no single site that list what has been updated/added/modified when an update is applied in Office.  I used to go to Release notes for Current Channel releases - Office release notes | Microsoft Learn, which was great.  Now, all that displays is bug fixes or security updates.

Can anyone provide a site which lists what has been done or added to Office?  I should not have to subscribe and watch YouTube channels to find out about things like REGEXEXTRACT or TRIMRANGE, Trim operators, etc.  For example, last week the pin for documents in the backstage on Open turned into a star.  I figured that out, yet it would be nice to look at a list in one area.

I should not have to find things out on the fly or in a class and say, "Oh.  They changed that."  That's ridiculous.

Any help is appreciated.