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For complex editing and manipulation of PDF files, you will need to purchase Adobe Acrobat. If you just want to be able to open or export existing files as PDF files, then there are free options. Acrobat Reader, Foxit Reader, or Windows Reader App are a few free options for viewing .pdf files. You can create a document in a word processor like Word, or Google Docs and save it as .pdf file, but further manipulation of that PDF will not be possible without Acrobat. Open Adobe Acrobat and press Tools > Create PDF. This is where you start when importing files to turn into a PDF or starting a new PDF from scratch. There are a number of import options to choose from, including importing a single or multiple files, a scanned file, a webpage, or the contents of your clipboard. Adobe limits its file support to Microsoft Office (2007 and later) or OpenOffice filetypes, as well as basic text (.txt, .rtf), image files, or other adobe products. Selecting a file will create a PDF copy of that file in the same location on your computer as the original file. With the file now opened, press "Edit PDF" and select a highlighted box of text. You can either type out the changes you want or utilize the options in the Format section. Press "Edit PDF" and select any highlighted image. Use the options in the Objects section to manipulate the image.
Determine how you will be using PDF files. Create a PDF file from an existing file. Edit text in the imported file. Edit images in the imported file.