Airplanes with more than one engine require a multi-engine rating (with only a few exceptions, such as the Cessna 337 Skymaster; there are a few reasons for this but it’s the exception and not the rule). The vast majority of jets have two or more engines (cue the Cirrus Vision Jet, pioneering single engine civil jet flight) and so plan on getting the multi-engine rating leading up to your jet experience. here