My pick would have to be the A Whole Nother Story trilogy, in which (spoiler warning) you can only travel back in time. But because time is in a loop of sorts, if you go before the beginning of time, you will be at the end of time. From there you can go back to any time you want to. And time paradoxes cannot be produced. Plus, your memories from the previous timeline exist as well as the memories from the new one.
Came to suggest this. I know it has some serious flaws, but it’s my absolute favourite book and I must have read it a dozen times. It got into my soul and it’s never left me. I love it so.
What flaws, if you don’t mind explaining?
And every time I have to think about what I would do differently. Such a great book!
I read this as a teen - my dad gave it to me. I think it was my first time travel book? It is permanently stuck in my head and I think about it all the time. I finally re read it last year or so, and it was as fun as I remembered!