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I really recommend you (or anyone, beginner or not) use the Godot game engine. It is a FOSS (free (as in freedom) open source software) growing game engine, which is being used more and more. It is very easy with which to start, supports C#, a very Pythonic language GDScript, C++ and a visual scripting interface. Godot supports both 2D and 3D, and as far as I know, unlike Unity3D (please, people, be sane and call the game engine Unity3D and the Linux DE Unity), it has an actual 2D renderer. Here are some games made with Godot.

I have a Ryzen 5 2400G system with an ASRock B450M Pro4 motherboard and no graphics card. I started undervolting the processor a long time ago with 1.25V (stable), I'd like now to undervolt more, but I have a problem now: I have seen this thread on Level1Techs forums, I have tried ZenStates, tried setting a voltage of 1.225V and 1.2V, the voltages have listed correctly, but according to zenpower, the core voltage still goes up to 1.25V. I also tried setting the voltage from the BIOS, but it still went to 1.25V (and again ZenStates shows the voltage I set).
 
To provide as much information as possible, here's how I tried to set the voltage in the BIOS:
I set "CPU Frequency and Voltage Change" (or similar, I took that term from the manual) to manual and set the voltage to 1.225 and frequency to 3600 (didn't change it). I saved the settings and booted.
 
The command with which I set the core voltage to 1.225V with ZenStates (the number sign indicating that the command was run as root):
# python zenstates.py -p 0 -d 8 -f 90 -v 34  
And the ZenStates output after both BIOS and ZenStates undervolt attempt:
# python zenstates.py -l P0 - Enabled - FID = 90 - DID = 8 - VID = 34 - Ratio = 36.00 - vCore = 1.22500 P1 - Enabled - FID = 8A - DID = C - VID = 5C - Ratio = 23.00 - vCore = 0.97500 P2 - Enabled - FID = 80 - DID = 10 - VID = 6C - Ratio = 16.00 - vCore = 0.87500 P3 - Disabled P4 - Disabled P5 - Disabled P6 - Disabled P7 - Disabled C6 State - Package - Enabled C6 State - Core - Disabled  
I have BIOS version P3.30.
The manual of the motherboard.
 
What could be the problem? Am I doing something wrongly?
(As a side question: assuming an average result from the silicon lottery, who far can I expect to be able to undervolt the processor?)
(I'm really sorry if I'm missing something (obvious). I'm also really sorry if I at some point stop answering. It probably means that I have found the solution and it was something too embarrassing. If I do find the solution on my own, I'll try to tell it, but I can't promise anything (sorry))

I'd suggest adding to the post that the RAM should click into place and you should not be able to see the golden pins. That can be a problem for many newcomers, like me.