What tech have you learned, are you learning, are you planning on learning?
At the start of the 2000s, I happily put together basic web pages using just HTML 4.01.
From 2003 to 2009, I got by almost entirely on xHTML 1.0 and CSS2.
In 2010, seeing how the web development landscape was changing (and how fast the pace of that change was accelerating) I decided to bite the bullet, ease off on the writing/journalism and invest some time and effort getting to grips with the technical side of the web.
I resolved to start learning at least one major technology per year (and pay attention to whatever else I came across in the meantime). Here's a list of the tech that I have started learning (and continued practising ever since) each year:
2016: jQuery / JSON / Ajax
Not sure about 2019, yet. For the last few years I've always written my server-side scripts in PHP, so I'm thinking it's probably time to get to grips with using Node.js instead (before I upgrade my PHP scripting from 5 to 7.)
With regard to sub-technologies / APIs / approaches etc. I'm pretty happy with what I have learned to put together using .htaccess, CSS Keyframes, CSS Flexbox, JSON-LD + Schema.org, CSS Custom Properties, HTML5 Audio & Video, CSS Grid, HTML5 Service Workers (and Web Workers), Progressive Web App technologies, ES2015 Modules, but sooner rather than later, I'd now also like to get my head around GD Library (via PHP), HTML5 Canvas, SVG animations and (as soon as possible) IndexedDB.
What about you? What technologies have you learned during the last decade? What are you currently teaching yourself? What are you planning to learn in the near future?