@Live000 - from the line trace node, he means to drag the “Blocking Hit” boolean off into a Branch node, and check to make sure the “Blocking Hit” value is “True” before doing the rest of your code.
Just right click, type “Branch” and make a Branch node. Then drag the red dot from your line trace that says “Blocking Hit” to the Branch node, and then connect it after your trace but before the rest of your code for playing the sound and checking the physics material.