Stars stay in the same spot on the HR diagram throughout their life cycle ---False
In the HR diagram the total brightness is plotted against the star's surface temperature. As a star progresses through its life cycle, it moves from one place to another along the HR diagram.
Over time, stars change or evolve as their core physics change. However, most of a star's life is located somewhere on the main sequence. Some areas of the HR chart are named, but stars can occupy any part.
A small star like the Sun gradually cools and loses its brilliance. During this transition, it passes through a planetary nebula phase and a white dwarf phase. After tens of millions of years, it will fade and become a black dwarf. Massive stars meet a more energetic and violent end.
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