Target Planning and Observation-Logging Software
Again, maybe this category isn’t absolutely essential, but with literally hundreds (millions?) of objects to see, it’s definitely helpful. In my case (Doug), I use Starry Night Pro for this purpose too, but others use a program called AstroPlanner. Either way, it’s important to find something with at least basic target planning and observation-logging capabilities so that your observation notes can have a long-term home. Find Starry Night Pro here: https://starrynight.com/. Learn more about AstroPlanner here: https://www.astroplanner.net/.