Star charts! Planisphere is useful for seeing what is up there and naked eye identifying constellations etc but a set oif charts is a must once you are at the scope. I have a set of Will Tirions charts that I piocked up at the Aust Geographic shop that is my most used accessory. Has lots of DSOs and is great for planning a nights viewing. Almost all the objects are reachable with ,odest aperture and with light pollution. One reason I like these charts is they have the lines connecting the stars in the constellations while the bigger fancier ones just show the boundaries, which is not as easy for beginners.
A bit fancier could be the Cambridge atlas or go the whole hog to Uranometria or similar. Collins Stars and Planets is a great addition also!
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