To install Jenkins, you just need to follow these five steps :
Install Java Version 8 : Jenkins is a Java based application, hence Java is a must.
Install Apache Tomcat Version 9 : Tomcat is essential to deploy Jenkins war file.
Download Jenkins war File : This war is must to install Jenkins.
Deploy Jenkins war File : You deploy Jenkins war file using Tomcat to run Jenkins.
Install Suggested Plugins : Install a list of plugins suggested by Jenkins.
Once the installation is complete, you will be able to see the Jenkins dashboard.