How can I be good at speaking(giving lecture)?

1- Practice
2- Boost your self confidence
3- Articulate every word well. Pronounce every word with clarity
4- Know your content well. Memorize it, so that you don’t have to use notes.
5- Ask Allah to help you
6- Read these verses:
رب اشرح لي صدري ويسر لي أمري واحلل عقدة من لساني يفقهوا قولي