Data structure and Algorithm

NOTE: Before going deep into data structure, you should have a good knowledge of programming either in C or in C++ or Java or Python etc

A data structure is a particular way of organizing data in a computer so that it can be used effectively. For example, we can store a list of items having the same data-type using the array data structure.
Notes
Data Structure Unit I 
Data Structure Unit - II
Data Structure Unit III 
Data Structure Unit - IV
Data Structure Unit - V

In theoretical computer science and mathematics, the theory of computation is the branch that deals with how efficiently problems can be solved on a model of computation, using an algorithm. The field is divided into three major branches: automata theory and languages, computability theory, and computational complexity theory, which are linked by the question: "What are the fundamental capabilities and limitations of computers?"