Hey,
i am very sorry but I am confused.
I want to ask about “Services” window Setting.
Do I need to have “Unity Analytics” enabled in services in order to use “Unity Ads” in my Unity game?
Yes you need to go to “Window” (in your toolbar) > General > Services.
then you need the SDK which you can download from the AssetStore, download it to your project and enable Ads from the Services tab. I dont think you need to enable anything else other than Ads
That is not a requirement, but it is a useful feature on its own. You can check the manual if you have any questions:
https://docs.unity3d.com/Manual/UnityAnalyticsOverview.html