It is important to adjust your truss rod. If it is bent too much in the wrong direction in either way it will affect the sound of your guitar. Additionally, it will put a lot of stress on the neck which is not good.
Action on a guitar is often described by most guitarist as its “playability”. Technically speaking, the action of a guitar is the distance between the string and the frets. If it’s too high, you need to lower an acoustic guitar’s action.
The lower the action (e.g. the closer the string to the fret), the easier to play. Here’s how to do it.