You can open a blank document or any file you wish to draw a straight line on.
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Open Photoshop
Select the brush tool
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You can change your brush, brush size, opacity and more using the options at the top of the screen. There’s also the option to change the colour using the colour picker on the right.
Click where you want your line to start
This can be anywhere on your document.
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Hold shift and click where you want your line to end
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You can also continue to hold the shift key and click elsewhere to draw more straight lines connected to your first one. This is a great way to draw shapes freehand.