Which knot is primarily used to finish off other knots and should not be used by itself for lifting?

The half hitch is a simple knot that is often used as a securing knot, primarily for finishing off other knots to prevent them from coming undone. It is effective in keeping the main knot tightly bound and provides additional security to your rigging setup. However, by itself, the half hitch lacks the necessary security and load-bearing capacity required for lifting applications. It is not designed to bear significant loads on its own, which is why it shouldn't be used for lifting purposes without being combined with other knots.

In the context of rigging and lifting, understanding the function and right application of each knot is crucial for safety. The half hitch is commonly utilized in conjunction with other knots to create a more secure and stable rigging system but does not provide the level of reliability required if used solo. Knowing when and how to use knots appropriately is essential for ensuring safe and effective rigging practices.