The home planet of the Caldari is Caldari Prime in system of Gallente. The Gallente prime, home planet of the Gallente, is located in same system.
The Caldari were once part of the Gallente Federation. Soon after the technology for interstellar travel was rediscovered in Gallente Federation the Caldari corporations started secret colonization of their own. Once the Gallente Federation found out of these colonies he Federation of course demanded that they are put under the authority of the Federation. The Caldari corporations declined. The relationships were tense and Caldari Prime was put under blockade. Eventually Caldari partisans in Caldari Prime sabotaged an underwater Gallente city. The Gallente retaliated with orbital bombardment and the Gallente - Caldari war began. The war lasted for a hundred years until the newly formed CONCORD was finally able to negotiate peace between the to factions. The Caldari Prime is still under Gallente control on this day and the relationships between Gallente and Caldari are very bad.
Caldari in PvE
Caldari rats deal kinetic and thermal damage with strong emphasis on kinetic damage as you go up in ship size. The best damage to use against Caldari is kinetic with thermal being second best.
The EWAR of choice for Caldari rats is jamming. This can make it annoying to fight against caldari rats.
The Caldari State offers full line of tech 1 ships for capsuleer use. The Caldari ships use both missile and hybrid weapons (moslty rail guns) and are build for shield tank.
The Caldari Navy also offers multiple upgraded navy faction ships for capsuleers.