How do I get a perfect lawn with stripes when I cut the lawn

Not quite sure here, but if you are referring to what I think, you would mow in one direction, get to the end, and turn around and mow in the opposite direction right next to the last run.

A perfect lawn does not have stripes, that's for vacuming carpets.

Ha ha, sorry but I don't know how to answer this one. I guess you are today's early bird, cause you got the worm.