I am using Raspberry 4 with Raspbian for an eight years old kid taking virtual lessons with Google class.

Now I am using Raspbian for Raspberry 4 for my eight-year-old Kid on his virtual classes with google class. So far, so good, keep it simple, and it will work. It has been less than a week, but it looks fine for now. 

A few recommendations/comments:

1- Use a full Raspberry kid, including cooler, power adaptor/cable, a USB sound card (or a headset), the HMDI to mini HDMI cable, ideally a wireless Keyboard/Mouse USB adapter and USB camera.

2- The Raspbian distro is light enough. I tested several distributions, and this one by far has the best performance.

3- Get an adequately sized HDMI monitor; kids learn better on larger screens.

4- Hands-free is better than a headset in low noise environments (and it also allows you to monitor the classes/conversations your self), otherwise on shared or noised environments, a handset will do better. Generally speaking, Kid to move a lot a cable-free is better (and safer) for them.

5- You can use Chromium with plugin extensions to regulate/block sites. Still, I highly recommend OpenDNS ($20 a year ) for a more comprehensive solution where you can specifically block/unblock specific webs.

6- We moved away from a Windows 10 computer using Microsoft Family and the Edge browser to Raspberry 4 with Rasphian and Chromium. W10 allowed me to fine-tune Parental controls and Screen time and even have an extreme log detail, but we needed to set free the notebook my son was using, and anyway believe kids need some room to explore, and also that person to person monitoring and tutoring on the use of the Internet will benefit kids more than fixed whitelists.

As an anecdote, I asked my six-year-old daughter to put together the already assembled parts to see if she knew the names of the pieces, and she said, ok, Dad, where is the CPU so I can start? She ended up plugging all the cables practically without my assistance..... and only has an issue finding the power on button. Lets now see how long it takes my son to find out how to hack the DNS restrictions.....