Draw straight paths using the Line Seg…
https://helpx.adobe.com/illustrator/using/tool-techniques/line-segment-tool.html
To draw a line using the Line Segment Tool, follow these steps: Select the Line Segment Tool from the Tools panel. Click and drag on your artboard to define the starting point of your line. Release the mouse button to set the endpoint of your line. Select the Line Segment Tool from the Tools panel. Click and drag on your artboard to define the starting point of your line.
Select the Line Segment Tool from the Tools panel.
Click and drag on your artboard to define the starting point of your line.
Release the mouse button to set the endpoint of your line.
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