Here are the steps to draw a straight line in Photoshop:

1. Find the line tools from the tools menu. Adobe Photoshop has a menu bar. On the left side of the Adobe Photoshop CC menu, you can find the line tool photoshop.
2. Select the line tool in photoshop.
3. Press shift and draw the straight line.

You can also use other methods such as using the brush tool or pen tool. Here are some links that provide more detailed information on how to draw straight lines in Photoshop:
- [Silo Path](https://www.silopath.com/how-to-draw-straight-lines-in-photoshop/)
- [Photoshop Buzz](https://www.photoshopbuzz.com/draw-straight-line-brush-tool/)
- [Maschituts](https://maschituts.com/how-to-draw-straight-lines-in-photoshop/)
- [WikiHow](https://www.wikihow.com/Make-Straight-Lines-in-Photoshop)
- [Shotkit](https://shotkit.com/straight-lines-photoshop/)