Risa

Ah... ok, wow, that's a lot of relativity to explain from scratch for a non-physicist. There must be someone else...

Here, this one is a bit dense but it addresses Star Trek by name, so:
https://www.youtube.com/watch?v=mTf4eqdQXpA

Bonus points for starting with the point that forget warp, subspace communication breaks causality already, so you don't even need to boldly go anywhere for any of it to be kinda busted.

If that's a bit too dry you can search for a similar subject line, there are TONS of explanations like this one out there.

Anyway, none of it makes sense, it's all for funsies anyway. Suspend disbelief, ye nerds, and enjoy your sci-fi.