“I already know how to build an anchor, set up a rappel, and belay in the normal way. Why should I learn . . .

• Five different ways to set up a top rope anchor?

• Rappel with a carabiner brake?

• Belay from above with a Munter hitch?

• Ascend a rope with a prusik tied with a shoelace?”

British expedition and big wall climbing expert Andy Kirkpatrick has an answer, from his outstanding book, “Down”: