I think it would really depend on who's doing the exploring.
Should we ever achieve post-biological transhumanism, there will likely be quite a number of "humans" exploring the Universe solo.
Personally, If I came across a early technological civilization, I'd pop a greetings buoy their way and keep moving if they didn't look too
A greetings buoy would just be a satellite, that's reasonably easily detectable, that basically sends out a friendly greetings letting the
civilization know they're not alone in the Universe, coupled with a data stream that shares cultural information without too much detail, with
encouragement to work on space technologies, and assurance that FTL is indeed possible.
I wouldn't give them any spoilers.
I wouldn't advance them any math, physics, engineering, or anything.
I'd leave them with the the equivalent of every National Geographic special detailing Earth, our people, our biosphere, and all the wonderful
interesting stuff, but, without any "security risk" details that could let on where we're actually located, or anything resembling very basic
biology that could potentially help out a hostile species in learning how to kill us.
Yeah. I'd pop a buoy their way as friendly greetings and encouragement, let them know it's just a buoy and that no one is hanging around or
planning on visiting them, and be on my merry way.
If they're interesting, I might stop in and live among them as one of them, or eye-ball and ear them from a safe distance, depending.