Interview nerves, what actually helps? - what worked for you?

I get tongue-tied when I am asked about my weaknesses. It has been weighing on me all week. The role is similar to my old job as a social media manager. Any questions to ask at the end?

Prepare three stories with a clear beginning, action and result, and adapt them to the questions.

Arrive early, drink water and take a slow breath before you walk in. It sounds simple but it helps.