Human in the loop
Where the person sits decides whether the review is real.
"A human reviews it" is not a design. Before the action on every item is safest and slowest, and right for anything irreversible. Before the action on a sample works when errors are independent and volume is high. After the action with a fast undo is fine for reversible things and useless for an email that has already sent.
Start with the human reviewing everything. Remove the human only after weeks of clean runs, and keep a person on anything that commits you: price, dates, scope and promises.
Find your way around
Learn it in the course, copy it from a playbook, see it work in a case study.