If you're a software developer I doubt you'll ever be able to learn everything that software developer has to offer. Every day new programming languages come out, technology changes and the process is updated.
All this amount of information makes it impossible for developers to actually learn everything they want. That's why they have to choose, and filtering information nowadays is gold.
"In computer programming, a software framework is an abstraction in which software providing generic functionality can be selectively changed by additional user-written code, thus providing application-specific software. A software framework is a universal, reusable software environment that provides particular functionality as part of a larger software platform to facilitate development of software applications, products and solutions. Software frameworks may include support programs, compilers, code libraries, tool sets, and application programming interfaces (APIs) that bring together all the different components to enable development of a project or system." (Source: https://en.wikipedia.org/wiki/Software_framework)
While there are A LOT of frameworks nowadays, how do you know which ones to choose?