What are the most important concepts to know in the following languages to land a job? [closed]

So I’ve been learning web development for a while, and I’m quite curious about what the most important concepts are that I should know in the following languages/frameworks (including HTML & CSS) to land a job:
HTML/CSS
Javascript
React
Node Js
Typescript

Basically, I want to know what the most important concepts are that interviewers look for.