Keeping control is key

Audiences remember the first and last thing they hear, so a bad answer to a question could jeopordise your whole presentation.

To begin, dont blag it, if you dont know tell them you will find out during the break or after the presentation. Offer the question back to the audience if appropriate for input or comments.

Stick to a structured methodology, this will stop you from ramblnig and keep to your point. One such model is PREP

Position - I think blue is the best colour for Powerpoint

Reason - because blue is used by 80% of corporates in their branding, which stands for cool calm and collective

Example - if you think to safe, solid environments like banking, accounting or even law, many of them use blue

Position, which is why I would use blue for Powerpoint as my first choice.