Hey there @ariekr! Welcome to Logseq.
The key to learning tagging is crucial to jumpstarting, and getting the most out of, your logseq experience.
The most useful resources for me in the beginning were OneStutteringMind’s [@Dario de Silva] beginners course as well as @Ramses basic intro to the Mastering Query Sprints on the forums. Particularly Lesson 2.
With respect to namespaces, the resource that really started to make things click for me was another thread on the forum. There are a few other threads on the forum with extensive discussions on namespaces which may also prove helpful.
Also Aryan Sawhney’s youtube videos were very helpful.
Hopefully, these will help get you started on your Logseq journey!