This is super simple. As long as your application (eg. MICROSOFT OFFICE) can print, you can create a PDF file.
Just download this freeware PDF Creator, install it and you are ready to go.
The download link is here >> PDF Creator Download
In your application, go to the Print Option. Instead of selecting your usual printer, select PDFCreator from the printer list.
Click the PRINT button and after a short wait, you will be asked where to save the file. Browse to the desired folder location and give it a filename. Your PDF file will be created, ready for sharing.
There are many other freeware out there for creating a PDF file of course. I am a long time user of PDF Creator and have found it to be robust and it comes at a good price, FREE.
And yes, you will obviously need a PDF reader (ADOBE, usually) to open & view the output file!