This video shows an inside and an outside corner on the flashing detail. Once you get the hang of it it’s fairly straightforward. Depending on the shape of the drip cap, you can do outside corners in once piece as well. I typically one piece the outside corner only when the drip edge comes down 90° or it’ll look funny. Note- that’s is the existing Tyvek from the concrete stair install, I overlap my Tyvek over the flashing. And another note, the overhead porch extends 10’ past this door 👍 I hope

How to Install Flashing on a Roof | Mastering the Roof by GAF