Content operations is slowly becoming its own discipline. Check out the most recent articles and reviews on operations for publishing, content marketing or other robust content production businesses.
When actually engineering and optimizing content for personalization, two major challenges arise: the Inventory problem and the Interpol problem.
If you think you may start a directory one day, Airtable is a great place for all that info, as well as anything else you could store in a jacked-up spreadsheet.
8.5.21: Build trust with your web content + links.
Volument is one of the most promising non-Google web analytics tools on the market. Read The Content Technologist review.
ConvertKit is an excellent ESP for subscription-focused businesses growing a product offering alongside their mailing list.