Welcome to Logseq and the community @jrcar! 
Have you already seen the Handbook within Logseq (click the ? in the bottom right corner)? It shows some best practices for using and organizing Logseq.
As for queries, makes sure to check out the posts tagged with lesson on this forum. They’re lessons I wrote some years ago about Logseq’s query language.
Feel free to send me a DM if you have any questions.