Learning Linux was probably the very best thing for my career.
The fact that I use Linux as my primary OS has been a positive in almost every interview I've been in as the interviewee. Linux has been used everywhere I've been, and that represents a huge amount of upskilling they can skip.
As an interviewer, I'd say that developers who use Linux generally understand their development stack better.
Fastmail, 100%. Reasons:
xxx@yyy [dot] lynndotpy [dot] dev
, for example.It replaced my finnicky NextCloud for half the cost.