Rock Climbing Basics: Toprope Belay Technique

Rest

http://www.justclimb.com/Tips-Getting-A-Rest.html

Safety Video - The Danger Of Open Quickdraws

Safety Video - The Danger Of Open Quickdraws
http://vimeo.com/29836772

Safety Video - The Danger Of Open Slings
http://vimeo.com/4138205

Rock Climbing Basics: Clipping a Quickdraw

Anchor cleaning for sport climbing

Production

How Carabiners Are Made

About using a GriGri

This official website "GRIGRI EXPERIENCE" provide more knowledge of the Petzl team and from the experience of users worldwide.

I think the most important is tying off the GRIGRI to have your hands free.

A video introducing the proper use of a GRIGRI :

How to belay the leader with a GRIGRI - Belaying techniques

A funny video demonstrate some bad belaying behavior: