Musicians struggle to understand how to use minor chords effectively in major key progressions

Amateur and intermediate musicians frequently get stuck when trying to incorporate chord iii (the minor chord built on the third scale degree) into their compositions in major keys, as it sounds unfamiliar and they lack clear guidance on when and how to use it musically. Existing music theory resources are either too academic and abstract, or too vague about practical application, leaving musicians unable to confidently integrate this chord into their progressions.