I have been working at Amazon part-time
I was able to choose the schedule that best fit me. They provided training videos beforehand, and on site shadowing the first day.
Overtime, the shift schedule would get packed due to always accepting new hires. It would be really competitive to get a shift, as well as recently the Amazon Shopper Position is being removed and... now incorporated to Wholefoods. Removing the main flexibility of choosing shifts.