There is an editorial board at a large US university so some quality assurance is implied.
The authors are from academic institutions from around the world, not just the Western world.
All material is curated and tagged, so it is possible to navigate to suitable material easily using keywords.
Not just text but videos and multimedia are used appropriately
Academic referencing is suitable, how to cite is on each page and allows further reading.
Article references link to journal articles, with no links to weak academic sources included
Some updating has taken place where dead links are highlighted as dead.