Thank you for your question! The Cesium community forum is a great resource for developers of all skill levels. You can use the search tool to find threads that are relevant to your questions. Our forum has been active for a few years, so there is a ton of information about a variety of topics. For instance, the following thread discusses PostGIS and CesiumJS: Cesium with Postgis
Let me know if you have any other questions or concerns.
-Sam