I am a relative beginner as well – been using Logseq for about a month now.
Contents started making sense to me when I started thinking of it as a global pinboard. (I got that idea from this thread.) Yes, it’s “just another page” but it has the special property of always being at hand in the right sidebar. Put whatever makes sense to you there for easy access – that seems to be its only purpose. (And if that’s correct, it seems misnamed to me.)