That's basically when it runs out of hydrogen. How long this takes depends a lot on the mass of the star - in a a very high-mass star ths can take just a few million years, in our Sun it takes about 10 billion years, and in red dwarves, it can take trillions of years for this to happen.
It will become a red giant.
A red giant can become a supernova.
I am pretty sure it becomes a giant if I'm not mistaken.
It is the mass of the main sequence star. "High mass" stars can become supergiants (not always red). If you go into more details, you will find this answer is a simplification, but it's OK for most purposes.
A main sequence star burns hydrogen to helium. Once a main sequence star exhausts all of the hydrogen, it begins to expand and burn helium causing if to become a red giant.
Color is related to surface temperature, and a "red giant" is cooler than a main sequence, medium-sized star like the Sun.
The next step in its life is to become a "red giant" star.
The next step in its life is to become a "red giant" star.
When the sun exhausts the hydrogen in its core and become a red giant.
A red main sequence star would be a red dwarf or a branch red giant. To be on the main sequence, you have to have hydrogen nuclear fusion.
Main-sequence,red giant,white dwarf.
All Stars will become a red giant , and there are also new Stars are borning.