Question about M.2 SSD
No, it doesn't work like that.
The CPU has a number of pci-e lanes, for that Ryzen 5 2600 it's 24 pci-e lanes.
The processors with integrated graphics like for example 2200G use 8 out of the 16 dedicated for the video card slot, to connect the integrated video card, so only 8 pci-e lanes will go to the video card slot.
Processors like Athlon 200ge or 3000g will have even less pci-e lanes - 200ge has 10 pci-e lanes (4 for video card, 2 for chipset and 4 for m.2 or 4 for chipset and 2 for m.2, not sure, doesn't matter anyway) and 3000g has only 6 pci-e lanes, 4 for the video card and 2 for the chipset. Hence, M.2 connectors would not work.
Those 24 pci-e lanes are split into 16 lanes going to video card pci-e x16 slot, 4 lanes going to the m.2 connector and 4 lanes going to the chipset.
The chipset then acts like a USB hub, but with pci-e lanes. It takes in those 4 pci-e 3.0 lanes and creates a bunch of pci-e 2.0 lanes - from memory I think the A320 chipset creates 4 pci-e 2.0 lanes, while B350 and B450 create 6 pci-e 2.0 lanes and x370 and x470 create 8 pci-e 2.0 lanes.
So those 4 pci-e lanes are split into pci-e x1 and x4 slots and maybe a second M.2 connector with only one or two pci-e lanes.
So your video card will remain at pci-e 3.0 x16 , the M.2 connector will work at pci-e 3.0 x4 if the controller on the SSD also uses 4 pci-e lanes.
Keep in mind that there's M.2 NVME SSDs which use pci-e lanes to communicate with the PC and get high speeds, and there's M.2 AHCI (SATA) SSDs which use SATA so they're slower (up to around 560 MB/s both ways).
Also, note that even if your system would restrict the video card slot to only 8 pci-e lanes (which is not the case), with that video card it wouldn't really make a difference, that video card is not powerful enough for the difference between 8 or 16 pci-e lanes to make a difference.
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