1. **Problem statement:** When the given net is folded into a cuboid, determine which two points join with point X. 2. **Understanding the net:** The net consists of six rectangles arranged in a cross shape. Point X is at the top-left corner of the top horizontal rectangle. 3. **Key idea:** When folded, edges that are adjacent in the 3D cuboid will join. We need to identify which points on the net will meet point X after folding. 4. **Analyzing adjacency:** - Point X is on the top-left of the top horizontal rectangle. - The rectangle below it has point I at its left end. - The bottom-most rectangle has point G at its bottom-left. 5. **Folding logic:** - The top horizontal rectangle folds down to meet the left vertical rectangle where point I is. - The bottom rectangle folds up to meet the left vertical rectangle where point G is. 6. **Conclusion:** Points I and G will join with point X when the net is folded into a cuboid. **Final answer:** Points $I$ and $G$ join with point $X$ when folded.