It’s almost no training for the app based companies who require to watch a few videos in regards safety, like always yield to pedestrians, don’t drive drunk etc but depends on the nature of business private companies might enforce different policies, i.e. if you deliver hazardous materials you’d need to add Hazmat endorsement by successfully passing DMV courses.

No training job have a decent driving record and good customer service and u will be fine.

I was a delivery driver for an auto parts store and the requirements were min 2 years with a drivers license clean driving record and to pass back ground check and drug test

Depends on the type of delivery