Started prepping for interviews by teaching the concepts to a rubber duck, feels stupid but it's working

Read that explaining a concept out loud exposes gaps faster than just re-reading notes, so I started literally talking through two pointers and sliding window to a rubber duck on my desk every morning. Felt absurd for the first few days. Caught myself hand-waving past the actual invariant on day three, which I never would've noticed just solving problems silently. Doing it before I touch any code now, not after.