[Tex2002ans]

Originally Posted by Gunivortus

My steps were (all under Windows 10):

1. Write my non-fiction text in LibreOffice, non-formatted, I use LO as it came on my desktop.
2. Put the text in my InDesign 5, formatted it, but without page numbering and added my images at the places they should.
3. Exported it to PDF. (Unfortunately, all png files were converted to jpg).
4. Used Calibre to convert the PDF to ePub. (I do not understand the many setting options Calibre offers for the conversion, so I used standards).

No. No. No.

Never use PDF as an input format.

PDF is designed as a final output/Print format.

Either go:

• LibreOffice -> DOCX -> EPUB
  
  • DOCX -> EPUB using Calibre (or other tools).
    
    • Note: Keep original source as ODT, but save a copy as DOCX. Most tools do DOCX->EPUB cleaner than ODT->EPUB conversions.
• LibreOffice -> InDesign -> EPUB

The #1 most important thing is learn to use Styles.

This allows you to:

• Cleanly carry over all text/formatting from Word/LibreOffice/InDesign.
• Create very clean HTML+CSS.

I wrote a lot about this in:

• 2020: "eBook Formatting in Sigil"

and the past few months, in many posts on Reddit:

• /r/LibreOffice: "Seeking advice on exporting .odt file to epub"
• /r/selfpublish: "PDF or Quark Layout to EPUB?"

Originally Posted by Gunivortus

If there's a better way to go through, I'm open for suggestions and then I do not have problems to pay some for needed software.

There's no need to pay, just take some time and learn to properly use what you already have.

Styles, Styles, Styles.

These 2 videos show you the advantages of Styles:

• Microsoft.com: "Using Styles in Word"
• Youtube: "How to REALLY use Microsoft Office: Word Styles 101"

In less than 20 minutes, you'll be miles ahead of 99% of people.

And don't be fooled by those titles...

Once you understand the idea behind Styles, you can find similar functionality within LibreOffice/Pages/InDesign/other programs.

Originally Posted by Turtle91

the image solution I use works very well but there are some devices that don't like it...usually older devices. [...]

SVG wrappers can make your image fill the entire screen and still keep it's proper aspect ratio - it doesn't get stretched or squished. This is awesome if you want a full 'page' graphic rather than something embedded in the text.

Yes, SVG wrappers are awesome, but the biggest caveat is it only works within EPUB.

So you always have to note:

This WILL NOT WORK if trying to sell the ebook on Amazon.

Side Note: If you want more discussion on what aspect ratios + SVG wrappers are, see:

• 2018: "SVG images - why?"