Locating corners include laying out and squaring the foundation, using a transit level or the 6-8-10 method, according to plans.
IRC: Chapter 4, section R403 (https://codes.iccsafe.org/content/IRC2018P4), covers footing placement and tolerances for a variety of masonry walls.
Process/Skill Questions:
NCCER Standards:
Masonry: Level One (L1NCCT28)
Masonry Level Two