Introduction Giving a talk is more difficult that it seems. Especially when your talk is about a high-level computing science subject. There are syntactical as well as semantical forms to be observed, and these might differ per environment.
Timing is an issue, and keeping the audience attention is too.
Since these talks have some points in common, we will focus on those points. As experience increases, giving talks becomes easier, but especially the first few need extensive preparation. If the first time you give the talk is in front of the intended audience you will get into trouble. There are basically two ways to practice your performance. Best is to do both, in the same order as below.