It seems that you haven’t yet watched tutorials on how the magnetic timeline works. There are many of varying quality free online but a search on YouTube will give you a few to watch. If there’s a large number of views you may have hit on the better tutorials. You’ll have a plethora of workflow issues until you grasp the magnetic timeline.
There are no “tracks” in FCPx. You can add a VO Clip and/or create a Secondary Story Line. They will attach to a clip in the Primary Storyline. You can move that attached point. You can temporarily disable the magnetic timeline. If none of this makes sense you really need to watch tutorials first.