Download Video: Posted by jmcmahon at TeacherTube.com.
The abovementioned video lists the prominent pitfalls when presenting your slides. If the video is slow in loading, the points mentioned are listed below:

Avoid wordy slides so as not to lose the audience’s attention.
Do check your spellings and finalise your slides before the presentations. (Remember, too many spelling error dents your [...]

Dear class,
There are times when some presenting teams have used certain colours that blend with the background of the slides. This has resulted in the team members straining their eyes to read the slides and it has compromised the understanding of their audiences with regard to their presentation as well.
Do make the effort to use contrasting [...]