Learn what "i don't know where to start" means, when people say it, and how to use it naturally in English.

This means the speaker feels overwhelmed and cannot decide how to begin.
From Two Worlds Apart, Episode 48
The speaker is overwhelmed and does not know how to begin dealing with a problem.
Use this when a task or conversation feels too big to start. It is very common, natural English for both work and personal problems.
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