The photo below (left) shows how to count stitches from the comer for right-handed stitchers. The marker is in the comer stitch; the stitch immediately to the left of the comer stitch is #1, the next stitch to the left is #2, and so on.
If you are a left-handed stitcher, whenever an instruction says “to right of “ or “to left of,” substitute the words “left" for “right" and “right" for “left.”
In the photo below (right), the marked stitch is the comer stitch; the stitch to the right of the comer stitch is #1, the next stitch to the right is #2, and so on.
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