>>511206745The Big Bang Theory is currently the theory with the most explanatory power for the evidence we have for the development of the universe. See: Hubble Constant and Cosmic Microwave Background (CMB) radiation
As the Big Bang energy condensed and formed matter this matter became attracted to itself forming stars, and star formed supernovas which produced various elements (some supernovas we can see the light of today and the elements they have produced). This then formed various planets.
Abiogenesis is currently the theory with the most explanatory power for the evidence we have for the origin of life. This is the chemical process of simple chemicals spontaneously forming things such as lipid membranes, amino acids, proteins, RNA, etc. We have experimentally confirmed that simple chemicals in nature can doe this very easily. As a matter of time and sheer scale one of these chemical compounds would have come together to form a hyper simple protocell, as this cell divides and mutates new genes these cells gain new abilities.
The theory of evolution is the most explanatory theory for the evidence we have that explains the origin of species. Organisms acquire mutations as they reproduce, those mutations that lead to more reproduction get passed on, over time this gives rise to new species.