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.
The first 15 lives of Harry August
Zelazny’s Amber series.
Langoliers by Stephen king was pretty interesting. Basically if you travel into the past, because it’s the past it’s redundant and done with there are these monsters (langoliers) that eat?? reality I guess. Concept is some people on a plane accidentally fly through a time portal and then have to escape
All you need is kill comes to mind.
The Gandalara Cycle
All you zombies by Heinlein. Totally blew my mind.
Rant: An Oral History of Buster Casey by Chuck Palahniuk
Not a book but a short story, but “By his Bootstraps” by Heinlein was the first time I came across a time travel story that made sense.
A lot of times people write time travel in entirely illogical ways.
“How to stop time” was FASCINATING read it when I was maybe 12??? Not a kids book, I was just a tiny grownup lol
Recursion by Blake Crouch. Almost feel like it’s better going in without knowing anything, but it’s a lot about time travel timelines.
All you Need is Kill. (The bases for Edge of Tommorow)
The protagonist loops to the beginning of the day everytime he is killed. So do the aliens.
In the book it plays out less like the “Super Mario Speed Run:” that the movie does. Where everything is the same every time (allowing for some no look kills). And more he just has a ton of hard won experience that means he can deal with the situations as they come up.
There is also a fun sub plot where he is annoyed because he keeps running out of ammo. So he has a sword made from a helicopter blade. Except learning to swing that much mass with an exosuit is suicidal, literally. The mass keeps swinging and you continue twisting and break your back. Thankfully he can still learn from that.
Only foward, Michael Marshall Smith
Making History by Stephen Fry. Absolutely great and would make an awesome miniseries, too.
The Chronicles of St Mary’s by Jodie Taylor, the first book is “One Damned Thing After Another” - historian’s using time travel to do proper first person research. It’s a time travel action adventure comedy with great characterisation and a spin off series.
The Doomsday Book by Connie Willis. 100% one of the most interesting books to read during the pandemic although it was published in 1992. In some near future, a historian from Oxford university time travels back to the black death in the medieval period but gets stranded because a pandemic begins in Oxford and all the people who are qualified to work the time machine are either deathly ill or prevented from entering the city due to quarantine. It’s a fantastic study in human nature, how two societies dealt with terrifying and untreatable infectious plagues and hands down the most absorbing and credible story of living in a medieval family/village/society. One of my favourite books ever and really prescient about how we dealt with pandemic life, even down to the panic over toilet rolls! Maybe the author herself had a time machine??
I really liked The Infinite Miles by Hannah Fergesen