that depends on how large the red or super red giant was. if it was a super red giant that is 1000X larger than a red giant. it will become a black hole
pulsar star and if it collapses even more a Black hole.
It happens when a star 8 times bigger than the sun(if the star is bigger it uses up more fuel/hydrogen)starts to run out of fuel and turns helium into heavier elements and when it finally reaches iron it collapses and turn into a neutron star, then a black hole.
If you mean "Black Holes" then they are formed when a star very many times bigger than the sun goes supernova and collapses in on itself.
Supernova
supernova
Depending on the size of the star: a neutron star or a black hole-
The death stage. It explodes and either collapses into a neutron star or collapses even more into a black hole in space.
The collapses star gets squeezed by collapses gas and turns into a black hole.
when a star collapses it is called a supernova, i learned about it in science today!
Neutron Star. It collapses and splits its atoms apart. It's composed of only neutrons.
A supernova occurs AFTER a star collapses suddenly. See related question
There's no mass range that's between "collapses into a neutron star or pulsar" and "collapses into a black hole". It'll be one or the other.