How can you differ or understand when you are giving off too much information about your business, your product or your idea.
Does it come with experience to gain that "realization trait" or it is something which we should already know?
Presentation is the second step , plan or preparation is the first step. Any person you meet , even for a sudden meeting in next 5 or 10 minutes , take few minutes to answer these 2 questions for yourself,
1. what is this persons background ?
2. what can i expect from him ?
Now you have framed the context and automatically your presentation will fit into it.
All the best !!
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