1. Bootstrap Paradox:
Imagine you went back in time and teach Newton laws of gravity before he discovers it. So wait, who is the author of that theory? You or Newton...? Just think about it!
2. Predestination Paradox:
John is coming to meet you and dies in a car crash. After a year, you discover Time travel and decide to save John. To reach the spot in time, you meet a car crash, due to high speed driving, and the person in other car dies. name of the person- John
3. Grandfather paradox:
The grandfather paradox is a paradox of time travel in which inconsistencies emerge through changing the past. The name comes from the paradox's description: a person travels to the past and kills their own grandfather before the conception of their father or mother, which prevents the time traveler's existence.
4. Polchinski's Paradox:
Suppose a boy enters into a wormhole and travels back to the moment before he enters the wormhole and prevent himself from entering the wormhole!?!