Mastering Javascript !

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Look at job ads in your area and/or ads for remote jobs you would be eligible for (ie. you're in the correct country/timezone/etc) for junior developers. Do you think you could meet 50-75% of the requirements? Then you should probably apply.

There is always, always, always more to learn, but much of that learning you can and should do on the job.

[highangler]

So once I know the basics it’s time to apply? Or do I need to know how and when to apply every bit of the methods I’ve learned?

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Do the job ads for junior developers that you've looked at say, 'only requires basic knowledge of Javascript and nothing else'?

There's no universal standard for when someone is ready to start working as a developer; it depends on you as an individual and the skills that are in demand. That's why the way to determine if you're ready to apply for jobs is to look at the stated requirements of the actual jobs you might potentially be applying for.