Well, it is using the Ubuntu font! https://pgexercises.com/css/site.css

Yeah, I have zero design sense and just went with the defaults of a bootswatch theme that I liked :-)

Yes, I know, that's what I am talking about. ;-)

That's exactly what good branding looks like!

Author here: out of curiosity, what would be your priorities for future exercises? Right now my list looks roughly like:

    - DDL
    - Advanced datatypes (JSON, arrays, etc)
    - GIS

This order is partly informed by the current support of the site: adding DDL exercises is a relatively minor bit of technical work, and then it's just writing. Everything else involves schema changes (or, possibly, a second database).

First, I appreciate the work you've done. Great stuff. Thanks.

Second, I don't imagine these topics fit well with the exercise based course material, but they are of interest to me:

Window Functions, Logic in the database vs in the code, Serialization, Normalization vs Denormalization, Object Relational Mapping, Concurrency & Transactions, Triggers

Glad you've found it useful! FWIW window functions are already covered in the Aggregation section.

The rest of it, yeah, as you say it's not so great a fit.

The order sounds reasonable - IMHO it correlates with the number of users who need that area of knowledge.