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When I use my pen tool I can add a curve lines, but I am unable to get a straight line after that.
In illustrator I just click the anchor point after the curve to then go straight, but on my windows computer I can not figure out how to do that in photoshop.
For the standard Pen Tool — After pulling a curve, hold down the Alt key and click the last anchor. This breaks the anchor's symmetry. You can then click to create a straight segment, or click-drag to create an un-smooth curve. This is the same functionality as Illustrator only you must hold the Alt key for the click.
For the Freeform Pen Tool — After dragging to create curved paths, hold down the Alt and release the "click". You will see the straight segment. You can then click again, release the Alt key, and continue to draw curved segments.
More detailed info here — see section called "Draw curves followed by straight lines".
For creating horizontal and vertical straight lines you can click for first point then press Shift and click for the second point (you need to be close to horizontal or vertical to succeed)
Shift with the Pen Tool will constrain paths to 90 or 45 degree angles. Yes those will be straight path segments, but without Shift you can merely click anywhere and the result will be a straight path. Shift is not necessary for merely straight path segments if you click rather than click-drag. It's a subtle difference, but a difference nonetheless. You really don't need the Shift key unless you want a 90 or 45 degree path.