when habil killed kabil then how hazrat Adam's progeny moved on. i mean what is the concept of generations.

Qabil killed Habil. Habil had a son named Sheeth. Allah sent down a Hawra (woman of paradise) and her name was Na’imah. Sheeth (Seth) married her. They gave birth to a girl named Hurriyah.

Source: Gods Emissaries Adam to Jesus by Sheikh Rizwan Arastu Page 62