Here are a list of planets you will be conquering (as Empire) or liberating (as Rebel Alliance):
Abregado-Rae
Aeten II
Alderaan
No! Alderaan is peaceful we have no weapons.... You would prefer another target? A military Target? Then name the System!
—Leia and Tarkin when the Death Star comes close to Alderaan
This planet is the first victim to the Imperial Death Stars Superlaser.
Alzoc III
Anaxes
Atzerri
Bespin
Bestine
Bonadan
Bothawui
Sidious and his Imperial Guard had to go there for a personal mission.
Byss
Carida
Corellia
Han Solos Millennium Falcon was manufactured at there.
Corulag
Coruscant
Coruscant! The entire planet is one entire city!
—Some guy said that
This planet is once a place friendly to Jedi till Sidious used Order 66 to create a Jedi Genocide and now the city infested planet is now an evil imperial planet.
Dagobah
This planet is where a Grand Master Jedi is exiled at.
Dantooine
Endor
This place is where the Ewoks are at
Eriadu
Fondor
The shipyards that can build big capital ships and also full of Mynocks which the pilots hate.
Fresia
The place the X-Wing prototypes were stationed at till the Rebels Stole them for later uses.
Geonosis
This place is where the Clone Wars first begin at.
Hoth
This planet is where the weather conditions were unfriendly at
Ilum
The planet jedis go there for construction of lightsabers. Also Boba Fett was in charge of hunting a pirate there.
Jabiim
Kashyyyk
The Planet of the Wookies.
Kessel
Very evil place because the Imperials built alot of prisons there.
Korriban
The planet of the evil sith lords. Very hated by Jedi due to the planet has alot of Dark Force energy.
Kuat
The evil planet due to they supported the Imperial Navy and the only thing they ever build is Star Destroyers.
Manaan
Mon Calamari
Without Ackbar and his people we would be slaves to the Emperor.
—Mon Mothma
Rebel Friendly planet due to an Admiral named Ackbar was once an imperial slave.
Naboo
The planet that Anakin Skywalker saved from the Trade Federation by blowing up a battleship.
Nal Hutta
Polus
Ryloth
Shola
Sullust
Taris
Tatooine
The planet that Anakin hated because his mom died there but also Luke joined Red Squadron due to his Uncle and Aunt died there.
Thyferra
The Empire attacked there including Vader himself due to pirates.
Vergesso Asteroids
Han Solo and Chewie had to plant something there.
Wayland
The place that the Droids went to intercept the network
Yavin 4
The Rebel Base that was saved by Luke from the Death Star.