How to add gradle and maven to Idea?

Question

Java

Please tell me how to add gradle in idea to a project with java or kotlin? I don’t find any buttons about gradle anywhere, there is only maven. I also saw a project template there - gradle, but firstly it requires you to specify some groupId, artifactId, version - I suspect that this is not what you need, and secondly it creates an empty project and I don't understand how to add source files to it code. There is no "add java file" button in the menu. :(
PS Well, or at least maven. By the way, it’s also not clear. There is some kind of menu on the side about maven, but there, when you click on the green plus sign, a file selection window for some reason just opens ... But how to add that the pom.xml itself is not clear...

Answer 1

If we are still talking about adding to Intellij IDEA itself, and not specifically to an existing project, then everything is quite simple:
1) First of all, both Gradle and Maven need to be installed on the PC (off.instructions for gradle and maven , Russian-language versions are easily googled) .
2) Then you need to activate the appropriate plugins in the IDE settings, they are directly called: Maven integration and Gradle.
3) In the settings items that appear (Settings > Build, Execution, Deployment > Build Tools > ...), enter the paths.
In principle, if at the first stage there were no fakups, then everything should work.