Like RAM, I won’t go into specific products because of the sheer number of options.
What you need to know about motherboards is that they need to support the features you want.
For some people it needs to have WiFi, maybe SLI-support, RGB-control, USB-C ports or a certain number of SATA or M.2 ports.
Most importantly a motherboard needs to fit in your PC case, since motherboards come in multiple form factors.
Most standard-size cases have space for ATX, smaller PC cases are for Micro-ATX and mini-ITX is typically reserved for cases with a very small “footprint”, maybe designed not to be noticed easily, or intended for a travel PC, as sort of a laptop-replacement. You might say “Why not just buy a laptop then?” Mini-ITX PC’s are often less expensive to build and you can more easily service them and more importantly, upgrade them with say a new Graphics Card. Where in laptops, most of the components are soldered and not designed to be replaced.
For a PC-enthusiast who wants to overclock, a strong VRM might be the most important feature, but I won’t go into that on this specific page.