Is it true biogenesis explains how life began on earth?

No, biogenesis is the creation of life from existing life sources - such as chicken and egg, or spider and egg. Abiogenesis is the hypothesis of the creation of living organisms from non-living materials.

The Urey-Miller experiments of 1952 in which they generated complex organic molecules, including amino acids, from much simpler pre-cursors is an early demonstration.

Other concepts consider that the 'hot smokers' on the ocean floors could have provided a suitable environment.

These latter are examples of abiogenesis.