Have a nodding acquaintance with somebody/something
Definition 1 of 2
Pro Tip 1/3Casual Knowledge
Use it to express a basic understanding of a topic, not in-depth expertise. 
I have a nodding acquaintance with quantum physics, mostly from articles online.
Pro Tip 2/3Not a Pro
Suitable when acknowledging your limitations on a subject. 
When it comes to repairing cars, I only have a nodding acquaintance with the subject.
Pro Tip 3/3Self-Awareness
Shows you're aware of what you know and don't know. 
As a tourist, I only have a nodding acquaintance with the local laws.
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