Add k2pdfopt to the wiki ?
https://www.willus.com/k2pdfopt/ An extremely usefull tool. Tough to build AUR package, but there's someone keeping up with the hard work, https://aur.archlinux.org/packages/k2pdfopt/ Not sure where to put it in the article.Not sure if it was suggested before.
I think it would be nice to discuss scaling pdf. I found a couple answers but found no supporting documentation in terms of how the posters found these answers.
Create a PDF from images
The man page of ImageMagick states "convert: Available for Backward compatiblity with ImageMagick's version 6 convert(1). Essentially, it is just an alias to a restrictive form of the magick(1) command, which should be used instead."
I think the wiki should recommend
$ magick input_1.jpg input_2.jpg Input_3.jpg out.pdf