Aapne toh mujhe dekha hoga Shiv (present) se Jilaan (past) me jaate hue par kisi ne ye nahi pucha ki iska raaz kya hai. Raja aur rani ki toh kahani sun li hogi aapne par ab jo kahani mai batane wala hu vo thodi tedhi hai
Mai aag jalata hu , aaiye sab baith kar suniye

As far as we know time only moves in one direction - forward but if you want to go visit universe at a point in past a famous paradox arises - The Grandfather Paradox. Let's assume that you went back in time and killed your grandfather. Would you still be born?

If you killed your grandfather, your mother/ father wouldn't have been born and you wouldn't have been born and hence you wouldn't have been time travelled to the past in the first place. Solution to this paradox? The action you did in the past wouldn't affect your future but-

To a copy where the future will be different, with another set of events which will influence future of that new universe not your own past. But if this happens it avoids the paradox. Let's see the what would have happened if your actions DID affect your future in your universe

You go back in time kill your grandfather so you aren't born and can't go back in time and can't kill your grandfather and then you're born and go back in time. See? This makes a loop , a complex loop. It's two parallel events happening at the same time! Is it possible?

Sub atomic particles do this regularly. It's called quantum superposition and it's responsible for the outcomes of double slit experiment, properties of atoms and molecules etc. If the universe exists in superposition state you're born and not born at the same time.

If you look at it , this looping timeline is consistent. When we think there is a paradox but there isn't. As Stephen Hawking said that
our brain measures time in a way where disorder increases in the direction of time – we never observe it working in the opposite direction.

Toh bas aaj ki kahani yahi khatam hoti hai ya shayad nahi :):
Hum chalte hai shikaar karna hai ab
Alvida!