@GoatIsLove it looks like a regular loop with a triangle end. To make a loop you cut half the amount of strings but double the length. You fold them in half and do bf or fb knots with one of the strings around where they are folded in half. It's a bit difficult to explain but you'll find many tutorials on YouTube if you search for friendship bracelet loop. Once you made the loop you do a triangle end. You'll again find some really great tutorials if you search for triangle end on YouTube. MashaKnots for example has a really good one. You could also check out my written tutorial on triangle ends here on braceletbook.
Wow! I love this pattern! I have made this a couple of times before and I want to make more! i love how the straight edges is built in! Stay safe, and happy knotting!