Paul,
I use Linux exclusively: a generic Ubuntu installation on my main workstation. I have used the native Linux Zoom client extensively, heavily, for work during the past several years -- without issue. I also used it for a CWOps class (with the same "native sound" tweak that people required on Windows boxes). I download the latest .deb straight from Zoom.
I use TSQL natively.
I use "qrq" for, I think, similar training as RufzXP.
And I've been using LibreOffice and its predecessors for more than 25 years now, including for work, graduate school, doctoral thesis, etc. It's solid and very capable. I just live with the fact that Microsoft doesn't want competitors to be open their documents with the formatting perfectly intact (and ask for a PDF if formatting matters).
73 de Todd W2TEF
Todd, W2TEF