CPU, SSD, PSU, and RAM (RAM shown isn't good for Ryzen, it likes faster memory, and the 3000 is only $9 more).

This is what I'd personally do.

PCPartPicker Part List

Nah, these aren't stupid questions, believe me. Anyways, to answer them:

1. You are correct, this setup does not need a separate graphics card. The Ryzen 3 2200G has integrated graphics that can do some pretty good gaming for the price, and considering that the graphics are integrated, you're getting a pretty good deal right there. Here's a video showing the capabilities of the VEGA 8 graphics integrated into the CPU die.

2. The difference between Windows 10 Home Full and OEM is what you're able to do in the sense of upgrading. Wanna change your motherboard in the future but buy a new copy of Windows? Go with the Full. If you don't see yourself doing that in the near future, however, then OEM is probably the way to go. Then again, it's all up to you. Basically, the OEM version is much, much more limited on how extensive your upgrades are. You can read more about that here.

3. I think the case has RGB. I can't find any documentation stating that it does, but all the pictures and videos I've seen show it with RGB lighting inside. So...I think it does? ¯_(ツ)_/¯

4. In the range of upgrades you'd be able to make with the extra $200 in your budget, you'd be able to add some more RAM (but for basic home use and the range of gaming I'm expecting you to have, 16 is plenty), a better CPU (Ryzen 5 2400G), and add an SSD into the mix if you want (faster drive). Below are two options within the realm of possibilities of upgrades with the extra cash:

Option 1: No RGB Inside

PCPartPicker Part List

Option 2: RGB Inside

PCPartPicker Part List

The main difference between the two is the size. Option one has a much smaller form factor, so if you're kinda tight on space, that's the way to go. The other option has the same case from last time, but also a separate graphics card, as sometimes that will be better in the long run if you're looking at future-proofing your build.

Anyways, I hope this helped, and goodness, this was a long response.

CPU, SSD, and RAM (RAM shown isn't good for Ryzen, it likes faster memory, and the 3000 is only $9 more).

With an $800 budget, you could go something like this:

PCPartPicker Part List

That gives you a pretty good build for 1080p at high settings in a small form factor.

A little over budget, but a larger form factor with a nicer motherboard and case:

PCPartPicker Part List

If you need more storage right away, you can cut out the GPU and go with the weaker Ryzen 5 2400G, which is still fairly capable for the price. It has 4 more threads and a stronger GPU than the Ryzen 3 2200G.

PCPartPicker Part List

Just a few ideas for you.

thank you! would you mind explaining the benefits of having a good SSD instead of and/or in addition to an internal hard drive?

ok