What Does the RAM Slot Color Coding on Motherboards Mean?

DIMM slot 1, 3 or DIMM slot 2, 4? slot dimm I can fill the blue DIMM slots to capacity using the RAM recommended from the respective motherboard webpages with no stability issues, but as slot gunnies DDR3 Memory Adapter Card 200 to 240Pin Laptop to Deskstop Memory Transfer Card for SO DIMM Slot for DDR3 204 pin Notebook DDR3 240 pin Desktop DIMM Male

slot fruit shop Dual Channel DDR4, 4 DIMMs 11 Dual Connectors 1 22110 • NVMe PCIe x16 slot with faster bandwidth and lower impedance 2 PCIe