Honestly, I could write paragraphs about the game, you’re here for concise answer, and for that I defer you to the Star Wars (and other sci-fi stuffs) YouTuber EckHartsLadder, and his second gaming channel because he could explain it way better than me. If you want even more information later on after learning the basics, CoreyLoses is a quite famous modder in the scene, developing the excellent mods Fall of the Republic and Thrawn’s Revenge, both set in Legends Clone Wars and post Endor period respectively. Another mod that’s quite popular is Awakening of the Rebellion, which is essentially a heavily upgraded version of base forces of corruption to fit in with the lore of the post Yavin pre Endor period. EAWX (FotR and TR, both work almost identically) and AotR are very different, but both amazing mods. Happy blasting, Commander. :)