Here I have made a coggle diagram to show the process of becoming a Junior front end developer. Essentially, I am showing the basic technologies you will need to learn to become a Junior Front end developer. 
HTML, CSS and Javascript are the foundational technologies you need. CSS and Javascript have additional frameworks such as Bootstrap and SCSS for CSS and Angular, React, Ember etc for Javascript.
The paths highlighted in red are essential. But you need only one of the orange highlighted options to start applying for a Junior position.
For instance, it will be essential for you to know the Native DOM API and jQuery (although you won't be using them much in modern web apps) if you are a Javascript developer. Having them under your belt will help you in troubleshooting bugs that may be tied to the DOM.
And only one of the frameworks and libraries (Angular, React, Ember, Vue..) will you need. But before learning these frameworks, you will need to have a good grasp of the plain Javascript's concepts of functions, objects, inheritance etc. Once you are confident you vanilla JS skills, try one of the frameworks to build a basic app. Always, make sure to checkout the website of the framework and the documentation of the APIs.
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