The powerpoint slides in the powerpoint presentation has to be in logical flow from beginning to end, like done in written work. You have to avoid jumping from point to point, and to adding information not related to the theme. To do this, it is strongly advised to draw an outline of the presentation and powerpoint slide before actually assembling the actual slides.
The powerpoint slide should have a maximum of six points per slide, with only six words per point. Avoid using text much in the powerpoint slide as depending on the color of the powerpoint presentation and font size selected, the text will be difficult to read. Not only that, if the audience pays too much attention on the written text, they will most likely not give you their full attention for your powerpoint presentation.