Editing PDF files for free on Linux can be done using various open-source software tools. One popular option is using LibreOffice Draw, which is part of the LibreOffice suite. Here's a step-by-step guide in around 500 words:

1. Install LibreOffice Draw:
If you don't already have LibreOffice installed, you can do so using your distribution's package manager. For example, on Debian-based systems like Ubuntu, you can use the following command:
```
sudo apt-get install libreoffice
```

2. Open PDF with LibreOffice Draw:
Once installed, open LibreOffice Draw. You can either use the application launcher or the terminal with the command `libreoffice --draw`.

3. Import PDF:
In LibreOffice Draw, go to `File Open` and navigate to the PDF file you want to edit. Select the PDF and click "Open."

4. Edit PDF Content:
LibreOffice Draw allows you to edit text, images, and other elements in the PDF file. To edit text, click on the text you want to change, and you can start typing. To edit images or other elements, you can select and modify them as needed.

5. Add or Delete Elements:
You can add new text, images, shapes, and other elements by using the respective tools in the toolbar. To delete elements, simply select them and press the "Delete" key.

6. Format Text and Objects:
LibreOffice Draw provides various formatting options for text and objects. Use the formatting toolbar to change fonts, colors, sizes, and styles of text. You can also apply formatting to shapes and images.

7. Save as PDF:
After making your edits, go to `File Export as PDF` to save your changes. You can choose the PDF export settings that best suit your needs.

8. Annotations and Comments:
If you want to add annotations or comments to the PDF, you can use the drawing tools and text boxes. This is useful for reviewing and collaborating on documents.

9. OCR for Scanned PDFs Optional:
If you're working with scanned PDFs, you may need to perform Optical Character Recognition OCR to make the text editable. You can use tools like "OCRmyPDF" or "gImageReader" to convert scanned images into editable text before importing them into LibreOffice Draw.

10. Additional Tools Optional:
If you need more advanced PDF editing capabilities, you can explore other open-source PDF editors like "PDFedit" or "Master PDF Editor." These tools may offer features like form filling, advanced text editing, and page manipulation.

11. Exporting to Other Formats Optional:
LibreOffice Draw allows you to export your edited PDFs to various formats, including images JPEG, PNG, vector formats SVG, or even as editable documents ODF, DOCX.

12. Save Your Work:
Don't forget to save your work regularly to avoid data loss. LibreOffice Draw uses the native ODT file format, which can be edited later if needed.

13. Finalize and Share:
Once you're satisfied with your edits, save the PDF and share it as needed. Make sure to review the final document to ensure all changes are correct.

In summary, LibreOffice Draw is a powerful and free tool for editing PDF files on Linux. It offers a range of editing and formatting options, making it suitable for most basic to intermediate PDF editing tasks. For more advanced features, you may want to explore specialized PDF editors available for Linux.

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