Beautiful animations are an effective way to make your presentations stand out. Take a look at One Skill PowerPoint Tutorials. My favorites:
Another impressive PowerPoint Tutorial account on YouTube is PowerPoint Pro. Here are some tutorials that stand out:
Do you deal with a lot of data? Take a look at how I converted an ordinary chart into a minimal, visually appealing chart that tells a story.
For additional help with data visualization, check out Cole Nussbaumer Knaflic's blog Storytelling with Data. I also recommend her book with the same title.
For anyone interested, I have a personal blog titled My Journey to Know the Savior where I share reflections about Jesus Christ.