I'm going to speak from frontend experience. JavaScript.
HTML and CSS are fairly easy to pick up (from my experience, and the stories of people I've talked to, at least) and they are also essential, but JavaScript takes more time and practice to really master. Start with the basics; jumping into frameworks like React, before learning the core language is just asking for trouble. Additionally, while a lot of places are moving away from using jQuery, you will still likely run into it on legacy applications, so once you have gotten a good handle on "vanilla" JavaScript, make jQuery your next step, even if it's not in-depth - then move on to one of the popular frameworks if you want to specialize.
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I'm going to speak from frontend experience.
JavaScript.
HTML and CSS are fairly easy to pick up (from my experience, and the stories of people I've talked to, at least) and they are also essential, but JavaScript takes more time and practice to really master. Start with the basics; jumping into frameworks like React, before learning the core language is just asking for trouble. Additionally, while a lot of places are moving away from using jQuery, you will still likely run into it on legacy applications, so once you have gotten a good handle on "vanilla" JavaScript, make jQuery your next step, even if it's not in-depth - then move on to one of the popular frameworks if you want to specialize.