SATA SSD vs PCIe SSD - What's the difference?

Need to know what PCIe Gen are the two SSD slots for Acer Nitro 5 m 2 ssd slot nvme pcie gen3 2230 NVMe Gen3 x4 PCIe SSD, available in 256GB, 512GB & 1TB Compatible with Valve Steam Deck, ASUS ROG Ally, Microsoft Surface Pro and ultra-thin m2 expansion slot PCIe slot – NVMe SSD will get detected If two SSDs are installed in a “Dual NVMe PCIe

m2 sata vs nvme slot Please help me regarding this Does my laptop support both SATA and PCIe NVMe ? Please clarify Which one should i buy Crucial P1 3D NAND