The Fallen Ace's Return (the AOE god)

Earth calendar year 2024 February 14

At this day many couples are all going for a date while many single are all staying at home trying to distract themselves to forget their jealousy.

But while these are all going a series of phenomenon happened all around the world causing chaos everywhere: many portals,dimensional rifts and cracks on the ground suddenly appeared where many creatures of legends came out, meteorites and UFO's rained down to earth bringing with them alien life forms, the dead rose from their graves, and viruses emerged.

All things that humans have both imagined and never imagined in their lives had occurred and among these was the appearance of the systems given to all humans and so the whole world was in chaos.
--------------------------------------------------------------
I'm just new to writing a novel so please help me by pointing out my mistakes
--------------------------------------------------------------