A sysadmin should have at least these (in reality many more undocumented yet) programs, procedures, and knowledge prepared:

Editing, filling and signing PDFs. Offline-first preferred.

• Stirling PDF toolkit: https://stirling-pdf.framalab.org/

• PDFArranger: easily rearrange, rotate, crop, insert and delete pages
• LibreOffice Draw: multiple operations, can export with settings

(Proprietary) Foxit PhantomPDF Business
(Proprietary) Adobe Acrobat Pro DC

(Proprietary) PDF Expert
(Proprietary) Adobe Acrobat Pro DC

Give cool presentations from a single index.html: https://impress.js.org

https://www.overleaf.com/learn/latex/Beamer → classic look presentations in LaTeX