I usually work with Macs but also use Linux and Windows.
At the time of writing, I'm learning Ruby, to be followed by Ruby on Rails.
Here are some of my computer qualifications:
Microsoft Certified Systems Administrator, Microsoft Certified Professional – Windows 2000 Server, Microsoft Certified Professional – Windows 2000 Network Environment
CompTIA Linux+, A+, Network+
CIW v. 5 Associate
Apple Certified Help Desk Specialist (lapsed)
Usual experience in typesetting, imaging and other software: MacOS (up to 10.15.1), Windows (up to 10), Linux (Ubuntu, Mint, etc.), Quark XPress 8, InDesign CC (2016), Microsoft Office (Windows, Mac, Android), iWorks, Photoshop, Pixelmator, Affinity Photo, Affinity Designer, FileMaker Pro, Illustrator, Acrobat Distiller, Dreamweaver, RapidWeaver, CSSEdit, SEEdit, Espresso, Fireworks, Flash, TeX, LaTeX, MySQL, PHP, PostgreSQL, various FTP programs, WordPress, etc.