I was only a back-end developer until I was introduced to HTML,CSS or any front-end technology by an ad about these courses by a certified coaching center. I wanted to mostly do self study on these technologies. The best approach I took was to look at the documentations of each of these technologies. React and Vue have amazing documentation. Angular I would rely more on videos from Todd Moto or egghead.io . It totally depends on your interest, according to me even if you work on a small program to replicate mario game you are a developer.
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