Why didn't Hades fight Cronus from inside him?
While Hades was trapped inside Cronus, he was young, weak, and without a weapon. Cronus was terribly strong and would not allow for the children he swallowed to overcome him.
How did Zeus Poseidon Hades get their powers?
Zeus, Poseidon, and Hades were all sons of Rhea and Kronos, powerful titans, and their powers were acquired from their parents and what realm they were assigned to control, for example, Zeus has the sky and he is in control of lightning.
Hades is not greedy, all he has is the dead so he could just want a little and he is differently not evil people say that but it is a myth
Hades did not have foster parents. His father is Chronus, and his mother is Rhea.
Does anybody still have any modern connections with hades?
Meaning Hell, yes, if you mean the souls currently there. But, otherwise, unless you have sold your soul to Satan, I don't believe any living humans have connections in Hades.
What powers does the hades have?
Hades was very powerful in battle and joined his brothers in the defeat of the Titans. He had three powerful weapons at his disposal: a helmet, a fork, and a staff. The helmet was given to him by the Cyclopes and made him invisible. The fork had two prongs and was powerful enough to shatter anything or anyone that he did not like. The staff was used to drive the dead into the Underworld. He also had a chariot with black horses which was not particularly powerful, just intimidating.
Hades was one of the strongest of the Olympians and had the ability to create fire and control it to harm an opponent. He was also immortal and impervious to harm.
What is the difference between purgatory and hell?
That depends on what your view of hell is. If hell is the place of fiery torment, then you've come to the right place! Hell, it is believed by Catholics etc, is where you go if you've led a bad life - a place of eternal fiery torment. However, purgatory is like a crossroad between heaven and hell - a bit like a junction where you go when you die. Your good deeds and bad deeds are compared and it is "decided" whether you go to heaven or hell.
Why would Greeks pray to hades?
For example: To make ensure that their deceased relatives would receive a happy life in the Underworld and to beg for him not to have them die when they are sick.