https://knitfreedom.com/blog/jssbo-je...

My favorite bind-off for toe-up socks is Jeny's Surprisingly Stretchy Bind-Off (JSSBO). It is easy to memorize, easy to do, stretchy, fast, and great for the tops of toe-up socks. Jeny's Surprisingly Stretchy Bind-Off works with 1x1 rib, 2x2 rib, or any combination of knits and purls.

The blog link above includes the free video and a step-by-step photo tutorial.