How To Find Out Which CPU is compatible With Your Motherboard
Amazon.com: ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard (128GB DDR4, 4400 O.C.), NVMe, HDMI 2.0b/DVI/D-Sub, USB 3.2 Gen 2, BIOS Flashback, and Aura Sync) :
What Is a Motherboard? Definition, Components, and Functions - Spiceworks
Which RAM Slots Should You Use?
Can I fit 2 graphics cards in one motherboard? - Quora