How complicated is it to learn a framework like React (which celebrated its 10 years 3 months ago) if you have a background in software engineering and some bas

How complicated is it to learn a framework like React (which celebrated its 10 years 3 months ago) if you have a background in software engineering and some basic knowledge of HTML/JS? Like an afternoon to read the doc? 3 days to practice and be totally fluent? I managed graphic designers who knew nothing about computers but were able to learn React and be very productive. The idea that React 10 years ago is the same as React today seems to be highly oversimplified. React was simple, then hooks were added, and state management fads that turned something simple and intuitive into an IQ signalling exercise. At least that was the case when I switched to back-end only dev a couple of years ago. And of course other parts of the stack also keep evolving: TypeScript (which is probably a positive, but again, I know people who do bizarre things with the language to build their "nerd cred"). Off the top of my head there was also Grunt/Gulp/Webpack/whatever is around now. NPM-Yarn->NPM. Angularjs->Angular 2.0+. How many different CSS positioning methods are there? (that's what led me to leaving front-end, I was expected to do a pixel-perfect rendering of a design for a time-critical back-office app for some reason).