Recommended settings versus a manual campaign
Learn the settings once manually; then decide for yourself what to automate.
After choosing an objective (Traffic shown: "send people to destinations such as your website, Instagram profile or Facebook event"), Meta offers Recommended settings or Manual campaign. The trainer chooses Manual "because the goal is to see and understand every single setting"; beginners in a hurry can take Recommended. "Pick the wrong objective and Meta optimizes for the wrong thing."
Knowing what the presets do is what makes trusting them safe.