Some ideas are:
- You branch off into another timeline and your actions make no difference to the previous timeline
- You’ve already taken said actions but just didn’t know about it so nothing changes
- Actions taken can have an effect (so you could suddenly erase yourself if you killed your parents)
- Only “nexus” or fixed events really matter, the timeline will sort itself out for minor changes
- something else entirely
Isn’t jumping forward and then changing stuff in your timeline just traveling to the past with extra steps? If doing something in the past changes the now changing something in the now based in future outcome would also change that outcome.
Jumping forward to change something in the future isn’t what I suggested. Jumping forward to learn and make a change in your present based on that knowledge is. It also depends on your timing. The farther ahead your jump, the bigger the change in the outcome, but it also depends on your relevance to the situation. It helps if you aren’t involved with the event.