It started from a singularity at zero energy. But within a fraction of the first few seconds there was an inflation of the universe. But what we understand by a fraction of the first few seconds, it is inconceivable by a normal human being. This is when time overlapped with space at the same time, which ultimately created the space time continuum and unfolding of events started to happen. Just similar to a magician when flushing playing cards, the cards become randomly arranged against one another. Exactly, similarly, the events unfolded like playing cards keeping a particular relation with the preceding event and the following event. That's how every part of the universe is linked with every other part and that's how everything is shaped in the universe in synchronisation with each other after the Big Bang followed by the inflation.