Generate Point at Intersection

On the Design tab, in the Editing group: Select Intersect | Generate Point at Intersection to generate a point where two lines intersect.

(You can also select Intersect | Intersection Point to insert points where selected strings intersect the current section plane (clipped view).

If no strings are selected, you will be prompted to select them. If you want to insert some but not all intersecting points, partial string selection is supported:

(On the Design tab, in the Utilities group, you can also select General | Insert Planar Intersections to generate intersection points where the strings in an input file intersect with a plane. See: Insert Planar Intersections)