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I would suggest downloading a programme called Calibre. It's designed to interconvert between different ebook formats (although the latest Amazon format - kfx8 - is problematic), and also has a built-in ebook reader. (If you purchase mostly from Amazon, you may wish to check the Calibre forum here about dealing with .kfx8 files which requires an older version of the Kindle app with automatic updating turned off.)
You may also need to download a store app - so for Amazon, you'll need the Kindle app for your specific operating system, for Kobo, you'll need the Kobo app. Some stores will additionally require you to use Adobe Digital Editions (ADE) - when you purchase an ebook, you get an .ascm file which you open in ADE to retrieve the text. If the book has DRM enabled, then you may not be able to save bits to your computer.
Books saved as PDF files will open in whatever programme you have installed as a PDF viewer. Apple computers will open .epub files in iBooks, Windows I think have a Windows ebook programme (I don't know - we're a Mac shop in my household). I've mentioned the 2 Amazon formats - .azw3 & .kfx8, and if you want to send a file to a Kindle (or Kindle app on a mobile device), you need to convert the file to .mobi first. PRC files are old Palm OS files - they're effectively .mobi.
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