I need to make a power point presentation for church.
Thank you. Jesus loves you.
Create a simple (!) presentation and save as ODP format. Don’t use animations or slide transitions; if yes, only simple ones.
After finishing save as PPT format and test on Powerpoint or Powerpoint Viewer, which is for free (download from Microsoft).
The more complicated animations and/or slide transitions you have, the more problems will be caused.
BUT!!! You could install LibreOffice on your church’s computer (or copy only as portable app).
cheers
As a complement to @Grantler’s answer: the LO component for that is called Impress. Access it through File
→ New
→ Presentation