Avoid mixture of half- and full-size characters The 40°slope is unstable.
Use the same font thoroughly Too many fonts may cause loss of consistency. Be careful when copy & paste something. Particularly mixture of half-size fonts is inappropriate.
Do not use small fonts • Do not use small fonts to put many things in one slide. The number of text lines within a slide should be around seven; it should not exceed ten. Otherwise your audience may not read what is written in your slide and will stop seeing the slide. • Also just reading out the text in the slide may be boring for the audience. Written text is just for reading, and speaking is for listening. Consider separately these two. Text in a slide should be friendly for eyes of the audience, and your voice should be properly delivered to their ears. Better to move to another slide
Do not leave a large space • Do not leave a large space within a slide. If there is room, you should enlarge figures and/or text. • However, elements within a slide need to be reasonably apart (should not be overlapped or too close).