I’m currently finishing up the Three Body Problem trilogy and it’s been excellent sci fi wise. It has high concepts and gets very jargon-y, but Cixin Liu (and I suspect Ken Liu, his English translator) do a good job of ending all the science fiction hoo haa with a story and plot you can understand and follow easily. The dimension stuff is particularly insane.

However, my favourite sci fi will always be Hyperion by Dan Simmons.