It's like the roads, paths and places on Earth - you use certain tools (maps, pictures, visits in person, etc.) and learn with time. Yaqub bhai just shared a very good tool. When I started, I used printed star charts.
A moderately experienced observer who can navigate his way across an urban sky can easily get lost among the myriads of stars ("landmarks") under an unpolluted sky.
Here is the log of the night when the above shot was taken on an international astronomy forum: A Night At The Hingol National Park.
There is not one but six galaxies (not including our Milky Way) that can be seen (two of these only by experienced observers with keen sight) without optical aid in a dark sky. Two such galaxies (NGC 224 and PGC 17223) were first recorded by Muslim astronomers.
With a pair of ordinary binoculars under a dark sky, one can see many more.
