On next screen do as following
Under General tab provide description.
In "Source Code Management" select "Git" and provide "Repository URL" (here I have used my git project available at url https://github.com/mitanjos/sping4hibernate5.git (this is a SpringBoot project with H2 database and Maven as build tool) and branch as master.
Not selected any trigger for basic project.
Under build section select "Invoke top-level Maven targets"
Select Maven version and provide maven task to be executed.
Once that is done click on "Save" button and it will create your first job.
Next click on "Build Now" to run a new build for this project and it will schedule a first build for this project. Click on the build number (in this case #1 and on the next page click on "Console output" and will show you build logs.
If you click on "Jenkins" icon (Home) it will show you "Dashboard" of all your projects (here only one project and only first build"
Thats all for this step.