Don't make your slides a transcript of all your talk! Spot the key points.
Don't expect the audience to guess all your thoughts and facts! Use handout (with Glossary, Graphics, Pictures, Tables, Diagrams etc.) or interactive materials QR-code whenever necessary.
Don't talk overtime! Structure your talk. Talk on schedule! (5 minutes is just it.)
Don't waste your presentation time on reading a number of different definitions of the same extra notion! Use Glossary. Introduce your final definition.
Don't talk too much about others' research! Talk about your own research.
Don't talk about other's books! You can show the references on your slides.
Don't expect your presentation animation and video work perfectly well on another's PC! (So keep extra video files in order to try to open them separately.)
Don't expect agreement of the audience on all your points. Try to justify all of your inferences and conclusions by scientific research methods and results.
Don't forget to answer questions clearly.
Don't speak Ruglish!
Don't cherish the idea that your Plagiarism % is quite unimportant.