In your work with Group Policy so far, you have probably noticed the phrase "Starter GPO". Every time that you click to create a new GPO, one of the options on that screen is to select a Source Starter GPO, but the option is initially grayed out. What is that thing?
Starter GPOs are sort of like GPO templates. You, as the primary Group Policy administrator, have the ability to create these special GPOs, called Starter GPOs, and then when junior-level administrators need to build out a GPO containing settings, they can look through the list of Starter GPOs and select one of these preconfigured policies that you put together. This gives you the ability to hand off the grunt work part of creating policies, while ensuring that the settings you always want configured are implemented inside the GPOs from the start. You are providing them with a starting point, so they do not have to reinvent the wheel of knowledge that you already took time to put together inside the Starter GPOs.
When that junior administrator goes to create a new GPO, they select a Starter GPO, and all of the settings baked into that Starter GPO get plugged into their new GPO automatically. It is also helpful for them if you provide comments alongside the settings that you configure, as those will also come through from the Starter GPO into their real GPO.