Should I learn Dart or Flutter?

Straight and forward answer, If you want to start using flutter for application development, learning basis concepts of dart would be handy . Dart is also a Object oriented programing language so if you’ve ever done programing before it won’t take much time for you to learn the basic syntax of dart.

Dart is an open source, purely object-oriented, optionally typed, and a class-based language which has excellent support for functional as well as reactive programming. Unlike C# or Java, Dart is not bloated at all. In fact, it’s a relatively simple, modern and highly efficient language to work with .