PowerPoint is an application for creating and delivering presentation. It was originally developed for public speaking and not specifically for teaching and what works in a boardroom may not necessarily work in a classroom. Its use in teaching and learning situations should provide a better way of communicating information to your students. Used thoughtfully, PowerPoint can enhance your teaching sessions by providing a roadmap, reinforcing what you say and allowing you to use graphics and other multimedia to clarify understanding and to support different learning styles.
Play to PowerPoint's strengths - it is a tool with strengths and weaknesses just like the other tools you use for teaching. Deciding when and where the different tools available might be used appropriately is a key to good teaching.
If you are a complete beginner with PowerPoint, you may wish to attend a training courses on PowerPoint offered by IT Services.