it's pretty simple so basically there's alphas who are usually dominant female alphas has penis and can both be pregnant and impregnate others. and there's omegas, male omegas can be pregnant. both omegas and alphas goes into hest/rut cycles which as yk makes them wanna fuck they also give off a type of pheromones to attract mates which betas, who are like normal people, can't smell it.
it gets complicated when there's stuff like recessive and dominant cuz they are different depending on the stories but usually recessive omegas mean they don't have the same traits as normal omegas such as giving off less pheromones, isn't as petite as normal omegas and unusual heat cycles. there's also domiant alphas which as the name suggests are more aggressive and assertive.
there's also somthing called marking which makes the person you marked your mate and if you've marked someone the marked person can't smell anyone else's pheromones.
this is as much as i can say it's the basics and they change alot depending on different verses ╥﹏╥

I usually never read omegaverse like ever in all the manhwas I read throughout the years so this is lowk like my official one I decided to keep reading. Can someone fill me in on omegaverse details