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The classic method is to crease the opposite site of the bend with a tool of some sort - I use a pointed nib in an Exacto handle, others use dull knifes and cetera. As already pointed out it is often easiest to do before cutting out the part since you have better leverage for the fold.
The possibly best but also possibly difficult is to back-mark the part (poke holes from the front at the ends of the lines, flip the part and draw LIGHTLY with pencil) and then cut a shallow V on the line with a fresh and sharp knife of your preference.
Also, folding with a straightedge after any technique can help the straightness.
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