what is the basic collision theory ?

The basic collision theory aims on some postulates that the any chemical reaction to occurr there is a collision processes or hits between the particles or atoms of the Reactant molecules that will result in breaking existing bond between this molecules and forming new bonds that combine together to form the end products of the Reaction
All the Process is simple as you see but there a lot of concepts you must be aware of for good understood of basic collision theory such as :

The Principles of Quantum Mechanics
Symmetry Operations on the Schrodinger Equation
The Description of Scattering Processes
Formal Scattering Theory
The Two-Body Problem with Central Forces
Scattering by Noncentral Forces
The Lifetime and Decay of Virtual States
Relativistic Description of the Scattering of Spin One-Half Particles by a Force Center
The Scattering and Photoproduction of Pi-Mesons from Nucleons
The Theory of Final State Interactions
Applications of Formal Scattering Theory to Field Theory
Dispersion Theory
Scattering by Systems of Bound Particles

A lot of concepts and theories you should study but also a lot of information about that concepts to help you master the basic collision theory concepts and postulates .

MGoldberger and Kenneth M. Watson arvin L. has wrote resourses Extensively on that theories with a huge index full of the Extensively explaination of basic collision theory and related theories the I mentioned above .
I remember that book was there you can see if they are still showing it

the basic collision theory and related concepts involved by extensively explanation in that book , that amazing Handbook save your time in discovering the whole information ,if you need additional resourses just type it in comments here .