I am working in a private company and try to contribute a lot to OSS with less success. I am interested in Nodejs, Angular, React and other interesting Javascript stuff. I like trying new frameworks and play with them by building sample applications.
I have interests in databases like Mongo,Rethink and Sql Server. I mostly worked in Microsoft platform, now slowly moving towards the awesome Javascript stack.
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Before you learn frameworks you need to learn Javascript Application Programming. This is the basic and then learn javascript design pattern. Once you are familiar with these things then only you can learn frameworks, they are nothing but concepts on which javascript code is written to make your work easier. https://www.amazon.com/Programming-JavaScript-Applications-Architecture-Libraries/dp/1491950293/ref=sr_1_1?ie=UTF8&qid=1473223229&sr=8-1&keywords=javascript+application+programming
Because there are many customizations they are forced to write their own. Also, when you submit many PR's to frameworks like Angular or React, it takes a while for accepting that.
Are you from Javascript background ? If so you need to learn SASS or LESS because its extensively used for adjusting the screen dimensions during runtime. Also Media Queries is used for that purpose. Please check Twitter Bootstrap section on Grids.