I don't know about blue giants, but red giants are at the end of a star's life.
A blue giant star goes through multiple stages during its life cycle: formation from a collapsing nebula, main sequence where it fuses hydrogen into helium, red giant phase where it expands and fuses heavier elements, and finally, depending on its mass, it may end as a supernova or a black hole.
The temperature of a blue giant star is between 12,500and 37,000 degrees Fahrenheit
The blue giant is blue because of the temperature of the gases surrounding the star. These stars are extremely hot.
In short... Nebula of gases --> Protostar --> Brown Dwarf --> Yellow Star --> Blue Giant --> Blue Super Giant --> Red Super Giant --> Super Nova --> Black Hole/Neutron Star/White Dwarf You should note that at any time in the life cycle of a star it may simply run out of fuel and then fade into a white dwarf. Interesting side-note if our sun should evolve into a blue giant it would eliminate all life on earth and if our sun were to run out of fuel and turn into a white dwarf it would eliminate all life on earth. Food for thought :)
sirius
A blue giant starts out as a nebula, with particles colliding until they form a very large, bright blue mass that is the star. When the star runs out of hydrogen in a few million years, it starts to burn other elements: Helium, Carbon, Neon, Oxygen, Silicon, then finally Iron. Then the outer layers explode in a huge supernova, while the core, under too much gravity, will collapse into a black hole, because the star is so massive.
the blue giant is the brightest star
Beta Piscium is a binary star system located in the constellation of Pisces. It consists of a giant star and a white dwarf star. The giant star is classified as a K-type giant, which means it is an orange star that is nearing the end of its life cycle.
blue stars are hotter
A blue giant is a massive, luminous star that appears blue in color due to its high temperature surface exceeding 10,000 degrees Celsius. They are much larger and more luminous than the Sun, and are typically in the later stages of their life cycle. Blue giants often end their lives in a dramatic explosion known as a supernova.
A blue star is formed from a collapsing nebula of dust and gas. It then goes through its main sequence phase where nuclear fusion occurs in its core, producing energy. Eventually, a blue star will evolve into a red giant or supergiant before shedding its outer layers in a violent explosion called a supernova.
None of those is a main sequence star.