Coordinate geometry is the branch of mathematics in which the position of a point is described in a plane. It consists of one of the most important parts of mathematics. By the definition of coordinate geometry, you can easily analyze the importance of this chapter wherever be a plane it simply means there is coordinate. It provides a relation between algebra and geometry through graphs of lines and curves. It mainly helps us to locate the points in a plane. Its uses are spread in all fields like trigonometry, calculus, dimensional geometry, etc. And the subject has obvious applications in statistics, physics also in real life for the construction field, the sketch of the building is pure geometry, in astrophysics to find the distance between the planets, coordinate geometry helps a lot. In JEE Mains or other entrance examinations, the examiner tries to check your strength by using the concept of coordinate geometry. In physics, Newton's Law, of Motion, Gravitational's Law, All types of forces even in measurement Coordinate geometry is used.
Geometry, as a logical system, is a means and even the most powerful means to make children feel the strength of the human spirit that is of their own spirit.H. FREUDENTHAL
In your childhood days, you used to play a Ludo Game
In this game, you followed the longest path. Have you ever think why you are using this path if your only target is to put the token into the endpoint as we have another option to choose the smallest path which directly put our token into the endpoint.
The answer is to make the game more interesting so, they defined some coordinates in the game where we can safe our tokens and it's mandatory to cross all those coordinates to make the game more interesting.
Ohhh! you are studying coordinate geometry from your childhood
After studying this chapter you definitely understand how Examiner has set Ludo for you.
Now take another example
Let suppose you and your school friends are planning to go for a tour.
The first thing that comes in your mind is to locate a meeting point and the meeting point should be shortest distance fo all.
So how you decide the meeting point?
Firstly you start sharing their home location.
Secondly, you decide on a location where everyone can easily reach the reason for reaching depends upon the availability of transport.
Thirdly, you choose a point in the direction of your tour so that it consumes less time.
The whole planning is done by using coordinate geometry.
Straight Lines: In earlier classes, you are familiar with Straight Lines now in this topic you will study some important properties of the line when straight lines are defined in coordinates.
The inclination of the Line: In a coordinate plane, a line cuts the xaxis and makes two angles with the xaxis, which are supplementary. The angle made by the line with the positive direction of xaxis and measured anticlockwise is called the inclination of the line.
Circle: A circle is defined as the set of all points in a coordinate plane that is equidistant from a fixed point in the plane.
Parabola: A parabola is defined as the set of all points in a coordinate plane that is equidistant from a fixed point and a fixed straight line in the plane.
Ellipse: An ellipse is defined as the set of all points in a plane such that the sum of whose distances from two fixed points in the plane is a constant.
Hyperbola: A Hyperbola is the set of all points in a plane such that the difference of whose distances from two fixed points in the plane is a constant.
Coordinate of a point in a plane
Slope and gradient
The angle between two intersecting lines, their intersection point, parallel lines and collinear lines
Focus and Eccentricity
Directrix
Latus Rectum
Maths NCERT Books are one of the most important study material as this book covers all the topics. Start from NCERT book, the example given in NCERT is simple and lucid. Most of the important concepts and theory you will understand by simply solving those given example. And also solve all problems (including miscellaneous problem) of NCERT. If you do this, your basic level of preparation will be completed.
Then you can refer to the books Coordinate by Amit M. Agarwal, Cengage Mathematics Coordinate Geometry or RD Sharma. Coordinate Geometry explained very beautifully in the book Arihant Algebra and there are lots of questions with crystal clear concepts. But again the choice of reference book depends on you, find the book that best suits you the best depending on how well you are clear with the concepts and the difficulty of the questions you require. Rather than referring all the books just stick to one good book but for practicing more problem you can refer to other books.
Chapters 
Chapters Name 
Chapter 1 

Chapter 2 

Chapter 3 

Chapter 4 

Chapter 5 

Chapter 6 

Chapter 7 

Chapter 8 

Chapter 9 

Chapter 11 

Chapter 12 

Chapter 13 

Chapter 14 

Chapter 15 

Chapter 16 
An ellipse passes through the foci of the hyperbola,
and its major and minor axes lie along the transverse and conjugate axes of the hyperbola respectively. If the product of eccentricities of the two conics is then which of the following points does not lie on the ellipse ?
If the tangent to the conic at (2, 10) touches the circle, (for some fixed k) at a point;then is:
If y + 3x = 0 is the equation of a chord of the circle, x^{2} + y^{2}  30x = 0, then the equation of the circle with this chord as diameter is :