Yes. Whether you are looking to improve the look and flow of your presentations or take them to the next level by integrating data analysis, Coursera offers a variety of courses and Specializations on PowerPoint skills. These courses are offered by respected schools like the University of Colorado Boulder and companies like PwC - a leading management consulting firm.
And, with constructive feedback on your presentations and peer collaboration on capstone projects, you will have the opportunities to hone your PowerPoint skills with the same attention to detail as on-campus alternatives - but at a substantially lower cost.