In our experience, you are best off looking around Dune and finding queries that you might find interesting and looking at the source code of those to learn.
Dune is a collaborative endeavor that is shared by it's users. The compounded knowledge of all analysts will allow you to get to results the fastest way. Seeing the queries live and in action does allow you to more intuitively engage with the content and learn faster.
Find great query creators and fork their queries for maximum efficiency.
Some of our best creators are these:
Nevertheless we have collected some queries here for a simple introduction: