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Flood Fill
Flood Fill is a traversal problem: the hard part is modeling the state you visit. It's a great warm-up that builds traversal modeling without a ton of moving parts. The trap is revisiting states or missing a base case; your visited/queue logic needs to be tight.
Learn this pattern
Arrays and Hashing Interview Questions
Arrays and hashing problems are about fast lookup choices: set for membership, map for attached state, and buckets when counts are bounded. Reach for this family when brute force compares too many pairs or when you need to remember what you saw earlier in one pass.
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Arrays and Hashing Interview Questions gives you a useful next rep while you are still on your phone.