Deposition preparation is about behaviour rather than content. A witness who follows a small number of rules will not create the damaging answer.
Listen to the whole question. Pause before answering. The pause also gives counsel time to object.
Answer only what was asked. The most damaging testimony comes from volunteered explanation. Yes, no, and I do not recall are complete answers.
Do not guess or estimate unless the estimate is genuinely known. An approximation offered helpfully becomes a fixed figure in the transcript.
Do not accept the questioner’s characterisation. If a question restates prior testimony inaccurately, say so.
Documents. Read any exhibit fully before answering questions about it, including the parts not highlighted, and say when a document is unfamiliar.
I do not know and I do not recall are different, and both are legitimate.
Privilege. Do not describe conversations with counsel; counsel will instruct where necessary.
The corporate representative deposition is different: the witness testifies to the organisation’s knowledge on designated topics, must be prepared on information reasonably available including from others, and personal ignorance is not an answer. Preparation for that role is a project, not a session.