This presentation tip may seem a no-brainer, but an astounding number of presenters don’t pay attention to their language, and therefore this topic definitely warrants a mention on this list. Your language both on your slides as well as in your delivery needs to be grammatically correct. On the slide, take care to avoid typos. Label your graphs properly. There is nothing more off-putting than poorly worded sentences and mis-spell words.
Remember to keep your language clean. Never use foul language, racial references, or language that is offensive to anyone in your audience.
There’s another element to this topic. When you speak, it is not enough if you are grammatically correct. You need to speak simply as well. Avoid jargon and too many acronyms. Your slides too should be written in simple English. Fluffy words, legalese and complicated sentences are best avoided.
Here is a great video presentation in Plain English.