Just highlighting a couple of helpful threads (ordered by topic):
GIT
Problem caused by adding a license file to GitHub project
Tags: license, .gitignore
https://open.hpi.de/courses/java-capstone-1/question/1e58c9cd-b95d-4ec5-8357-0e975854ab5d
IDE
Working with another IDE than Eclipse
Tags: IntelliJ, Netbeans
https://open.hpi.de/courses/java-capstone-1/question/0f5e6ab8-bd47-4b02-a74e-e0771fc1e821