What is the origin of the idiom "stand someone or something in good stead" and when to use it?

The idiom "stand someone or something in good stead" has origins in the practice of horseback riding. The phrase "in good stead" refers to the position that a rider takes in the saddle, which is a balanced and secure position that enables the rider to stay on the horse and ride effectively. In the context of the idiom, it means that having a particular quality or skill will be advantageous in the future, much like a good riding position is advantageous for a horseback rider. The usage of the idiom has since expanded beyond horseback riding and can now refer to any situation where having a particular quality or skill will be beneficial or advantageous in the future.