It seems that the world has changed quite a lot since 2019--nothing insurmountable, though quite varied in what technologies might now make up a stack.
What wold you suggest that I learn, as someone who wants to bring their skill up to what the market seeks? A fellow suggested that I start by learning React and how to work with APIs and API development.
If you will, what do you believe that a person MUST know in 2021 to be effective and attractive in the market?
I'm willing to tackle anything.
React and APIs are safe bets, but make sure you understand React in the context of JavaScript and not the other way around. If you want to set yourself apart, learn TypeScript and GraphQL. As for APIs, are you looking to consume them in a front-end application? Or build an API on the back?
It sounds like your focus is primarily front-end. If you want to go "full stack", go MERN. You can use MongoDB's cloud-based Atlas or real-time Realm for your database.
I look forward to the State of JS survey results every year. This gives you an idea of what developers are using, whether they love or hate it, and what they want to learn https://2020.stateofjs.com/en-US/
I recommend familiarizing yourself with ReactJS is a very convenient development tool. But it requires a lot of study and practice.
So if you need a cross-platform application but you do not have the necessary experience, you can contact the IT Master Soft - https://itmaster-soft.com/en/react-native-development-servic...
Cheers!