EXCEL draws coordinates. On the problem of grid lines.

Right-click the X axis in the chart, and click Axis Format-Scale-Sub-scale Unit in the drop-down menu, and select an appropriate value (for example, the major scale unit is 1, that is, 0. 1. In short, take one tenth of the major scale unit), click OK, then right-click the chart, and select Chart Options-Grid Line-Sub-grid Line (X axis) in the drop-down menu and confirm.