- Repeat 1st until you won't master it
- Node, npm, some build tools like rollup.js with at least babel plugin
- Learn how to write custom node scripts and automate your front-end. Don't use gulp/grunt/bower/whatever
- Don't learn any frameworks, learn software architecture and engineering principles, paradigms, design patterns, best practices, algorithms. Take a look onto MVC.
- For styling start from SASS but keep learning all the latest CSS standards and features. Take a look into ITCSS and BEM. Browse the source code of Bootstrap 4, try to configure BS4 with SASS and write custom code on top of it.
- For HTML - HTML5, HTML5.1, Web components, Web accessibility, start using semantics as much as possible, custom tags and attributes are ok.
- Try to build your own simple tempalting engine to understand how it works
- Try to build own small framework/library, you can take a look into source of Monkberry, Vue.js, React
- Try to build own simple routing, you can also play with latest browser History API and pushState
- Try to build custom vanilla JS simple app like TodoMVC from scratch
Now you can waste time learning any of thousands of frameworks around but I believe you won't finish my starter list until you will find a job as a jr. front-end engineer where you will have to learn some tools, frameworks which company is using anyway.