I think the Big Bang is false, it is not science at this point but has become a religion of some sort and here are a few simple points why that is the case.
If an object physically moves away or toward the observer, their speed is subtracted or added to the energy that the light that they emits have. Redshift if it is going away from the observer and blueshift if it comes toward the observer. The redshift of galaxies is used as evidence for the Big Bang.
That would not be the case if space itself expanded, however. There would (theoretically at least) be no energy subtracted or added to the photon as a result of it, the photons would just have a greater distance to travel (and over a wider area).
Read a while ago (must have been during in the 00s) that Hubble, the discoverer of galactic redshift, believed there was another explanation for the redshift of galaxies beside increasing distance but the mainstream doesn’t say that. Doesn´t even say what other theories there were a