How did dark matter likely initiate the formation of galaxies in the early universe?

Galaxies started as small, relatively uniform clumps of dark matter and gas, which gravity caused to attract more matter.

The formation process of galaxies is intrinsically linked to the presence of dark matter from the earliest times. The prevailing view suggests that galaxies began as small, relatively uniform clumps consisting of both dark matter and ordinary gas in the early universe. Gravity acted upon these initial concentrations, causing the clumps to attract surrounding matter, leading to denser regions that began to collapse and spin up. This process of gravitational collapse into dark matter gravitational wells allowed gas to concentrate, heat, cool, and eventually form the first stars and spiral disks observed today.