There many concepts or ideas you can explain technically. The way a computer works, technical safety measures for bridges, or technical requirements for creating medicine are all types of these topics.
Sometimes, technical papers will be a technical discussion of something that isn't very technical. Examples of these types of paper and presentation topics include a technical explanation of animal habitats. The habitats themselves are not very technical, but once you begin to explain the amount of soil needed, various water and weather requirements, and the other animals necessary for the ecosystem to thrive, you can begin to be very technical in your explanation.
Other types of technical paper presentation topics include those that discuss a technical process in step-by-step directions. writing computer code or building a bridge are both technical topics requiring your paper and your presentation to focus on the steps needed to complete the task.
Some topics for technical papers and presentations are of exploratory topics. For advanced courses, or courses that deal with things such as space or time you might see several topics that encourage you to explore more as you write them. Paradoxes of the universe" or time travel are technical ideas that can be explored more in depth as you work with the paper and presentation.