Soft shackle loop and a diamond knot - https://www.yachtingmonthly.com/gear/softshackles-38323
I ordered some dyneema line and while I have been waiting for it to start on a basic splice, I also found some other useful links / videos on line.
Premium Ropes has a lot of info on splicing; videos, tools, ropes, etc. https://www.premiumropes.com/splicing-rope
Here is one of their more advanced (to me) splicing videos Splice an integrated soft shackle on a rope https://youtu.be/rRKOkYqWpug
The video with its music, no voice over, etc. without a voice over, seems like watching a "magic trick" with ropes to me.

I'll post my first splice next week.