Scratch the surface
Meaning: to deal with only a small part of a subject or a problem, study something superficially
Example: He examines all the facts closely, he doesn’t just scratch the surface. All the payments we’ve made have hardly scratched the surface of the amount we borrowed
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Example: He examines all the facts closely, he doesn’t just scratch the surface. All the payments we’ve made have hardly scratched the surface of the amount we borrowed