Coruscant seems like the center of the galaxy. The planet is a fast paced city planet and is home to some of the greatest organizations in the galaxy. The Republic is centered around the Galactic Senate which is located in Coruscant. The Jedi Order has also established a temple on Coruscant where they sit in serenity while the world goes on around them. Coruscant is split into levels; the lower you go, the worse the crime and conduct gets.
Duro is home to the species known as Duros. Duro is a jungle planet with a famous shipyard. Duro's spaceyards are where some of the Republic gets its ships. There is not much to Duro. It is centered around its ships and some Duros have made a few space stations to live closer to their work.
Jerrilek is not a well known world. Jerrilek is a tropical vacation world, but during war times, the Republic uses it for a military base. Anyone stationed on Jerrilek is lucky; they get to vacation while they work.
Fondor is home to the Techno Union. Fondor itself is home to a famous shipyard and its shipyard outclasses Duro's shipyard. That is why the Techno Union is rich for its powerful ships constructed on Fondor.