One real simple way to make a spring Inventor software. Go to the 3-D sketch bar, and use the coil. You can set the coil in length, diameter and number of coils- you can also set the coil ends if you want flat ends. Then set a plane at the point of the coil and perpendicular to it . Then set a sketch on the new plane. Draw a circle ⭕️ on the new plane, with the circle center at the point of the plane. The diameter of this circle will be the diameter of the wire that makes the coil. Then use the extrude path function, the circle will be the Element and the coil will be the path. So this is a simple way to make a coil without any specialty functions. Hope that this helps 👍.