I have used 1/4 inch graph paper or index cards with 1/4 inch lines to check where the edge of the presser foot is in relation to where the needle comes down.
I liken it to driving down a road and knowing where the edge of the road is in relation to where my car is.
One eventuslly learns that maybe one has 1/16 inch of fabric showing to the right of the presser foot, or thst it is exactly even with the edge - whatevrr works.
I've also marked the seam lines on the fabric to learn where the presser foot edge is.
These sentences are rrally awkward - I hope at least some of you are " getting" what I mean.