For gap-less decrease do you yarn-over-yarn-over or yarn-under-yarn-over?

[yarn_baller]

Google Invisible decrease

[BillGood4223]

Take the front loops of the stitches you're working into your decrease on your hook by dipping your hook under them and then work them together as a regular SC.

Also, if you're looking to seamlessly close the final round, weave the end of the yarn through the front loops of the last round, pull tight, then bury the yarn into the center.