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.
I love short story anthologies for these sorts of things, like The Time Traveler’s Almanac. The time travel mechanic is almost always explained in every story since it usually sets up or drives the conflict in the story. You end up with back to back bites of stories that explore lots of ideas.