There are many different types of carabiner, all designed for different purposes. We might see many types on sale in a climbing shop, but for the most part, when rock climbing we use very few different types, especially as beginners.
This video should give you a basic understanding of the types of carabiner we need to start climbing. From clipping bolts or gear, building anchors or belaying.
Please feel free to contact me if you would like to discuss any aspect of this post or other skills and never forget, always lock your gates!