For writing mathematics in WordPress using LaTeX I have been using Pavel Holoborodko’s nice QuickLaTeX plugin. It makes it very easy to convert offline LaTeX source code, possibly including custom macros, into (part of) a WordPress post. To reduce the effort a bit further, I wrote a tiny Python 3 script.
In the late 1990s I used Linux for the first time. Back then, Slackware was one of a limited number of distributions on the market. Installation took very long and failed repeatedly. Partly this was due to my slow and unreliable internet connection, but my inexperience and incompetence were likely at least as detrimental to my progress. From what I remember I managed to set up X11 with the aid of a configuration script that asked me many questions to which I guessed most answers. I also found out how to make Linux talk to my external dial-up modem. No longer chained by evil Microsoft, I felt very proud and particularly hackerish.