We see hundreds of tiny points of light scattered across the sky. Some stars are very bright, many are dim. If we stare at one star, it will probably twinkle, appearing to flicker in brightness. Apart from twinkling, though, the brightest stars remain bright, while the faint stars remain faint. After some time we become aware that the stars do not change position compared to other stars.
Most stars seem to be scattered randomly, like hands full of pebbles thrown on the ground.
But in some parts of the sky we see some pattern. One of the easiest to recognize is three fairly bright stars lined up in a row to form the belt of Orion. The three stars lined up in the middle stay in line throughout the night. You can check this by holding up a ruler or straight edge at arms length and lining it up with two of the three stars. So the positions of these stars compared to one another do not change.