T568B is the one everyone uses while T568A is the odd one.

I don't get what's particularly bad about T568A though? I was told it's just plain worse than T568B for anything faster than gigabit and I swear I never saw any store bought cables using it.

Back at the beginning of times ethernet, you needed the crossover cables to connect routers to routers, switches to switches or end devices to end devices. They wouldn't work with the straight cables.

The standard still needs those cables to be crossover, but nowadays the port itself can detect what type of cable you connected, what type of cable it needs, and rewire itself to accept whatever you throw at it.

The same thing happens when you directly connect 2 PCs together without a switch in the middle. But the ports also adapt themselves and work it out.

You could also use a crossover cable, and your devices would figure it out too.