Level 3.0: Honeycomb
Zero-touch enables simple, out of box enrolment for Android devices. The following resources may help you to get started. 
What is zero-touch enrolment?
Zero-touch enrolment allows IT admins to assign corporate devices to one (or multiple) EMM servers on purchase from a zero-touch reseller. Once assigned, devices will attempt to begin the provisioning and enrolment process as soon as a network connection is established fresh out of the box, no further configuration required.
If you're familiar with Knox Mobile Enrolment (KME), Apple DEP, or Windows AutoPilot, it's a very similar solution. 
Read more about zero-touch: 
What devices support zero-touch?
Today, devices running Android 8.0 or later can support zero-touch optionally, and all devices running 9.0 or later support it by default, including Samsung (🎉).
Can devices purchased from anywhere be used with zero-touch?
No, only devices purchased from authorised resellers are eligible for zero-touch today. Resellers have access to the zero-touch reseller portal and will be able to upload purchased devices. 
A list of current zero-touch resellers can be located here.
Does my EMM support zero-touch enrolment?
You'll be hard-pressed to find any EMM in 2023 that does not support zero-touch enrolment, but if you want to be sure, check out this pre-filtered link to the solutions directory.
I'm having issues with zero-touch
Most commonly when issues arise it is due to - 
  1. Network
  2. Configuration
  3. Incorrect assignment
Network - Zero-touch won't initiate if there's no valid network, be that WiFi or LTE. If the device continues to setup normally without zero-touch initiation, check the network the device is connecting/connected to has access to Google services.
Configuration - Often a configuration is created, but not assigned. Keep in mind unless the configuration is set to default, no newly added devices into the zero-touch portal will receive the configuration. Ensure the device is listed (IMEI/serial) in the portal and a configuration is assigned to it.
Assignment - Sometimes devices are added with an incorrect, or mistyped manufacturer name. If devices show correctly in the portal, with a valid configuration assigned, and the device has network access to Google services, reach out to your reseller to validate the devices have been correctly added to the portal.
Any further questions? Ask the community!