The other week I had a chance to work with some folks who wanted to learn how to build anchors for top roping. The three things that I wanted them to know about anchors is that
1 it should be simple
3 easily inspected
If your partner can't identify how the anchor is built, its probably confusing and potentially risky.
If it's not simple then it can have many points of failure.
If it's not safe and equalized, your dead.
We focused on the figure 8 knot and making the anchor safe and equalized.
Here are some photos from our lesson.