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Creating Your First Spring Boot Application

Prerequisites:

- Java 1.8+ (http://www.oracle.com) 

- Maven (https://maven.apache.org) 

- IDE (Spring STS, IntelliJ, etc.) (https://spring.io/tools)

POM:

A Project Object Model or POM is the fundamental unit of work in Maven. It is an XML file that contains information about the project and configuration details used by Maven to build the project. 

The minimum requirement for a POM are the following:

§  project root

§  modelVersion - 

§  groupId - the id of the project's group.

§  artifactId - the id of the artifact (project)

§  version - the version of the artifact under the specified group

maven dependecy:
<parent>
<groupid>org.springframework.boot</groupid>
<artifactid> spring-boot-starter-parent</artifactid>
 <version>1.3.0.RELEASE</version>
</parent>

Spring Boot Initializers
Web initializer 
http://start.spring.io

Command line 
Spring boot CLI

Go to google search spring
documentation