When you see someone on Udemy promising to take you from JavaScript Zero to JavaScript Hero in only 2 weeks, it's easy to be skeptical. What about ...
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Often times what I have seen happen for most people is that they go take a course and have two options A: Their organization has a need or growth opportunity to use the skill B: Spend spare time nurturing that new skill after hours. The biggest hurdle that I see with most of the courses is that build tools tend to be a big stumbling block for most beginners. Just my simple opinion.
By taking multiple online courses, researching and experimenting a lot on your personal projects definitely.
Good points. Development is learn-by-doing, more than anything else.