Which eclipse IDE shortcut/feature you wish you had known sooner?

Off lately, I have started using jUnit in eclipse and it continues to baffle me how little I know of my IDE and how powerful it can be.

Do you have come across such features or shortcuts or subtleties that you wish you had known sooner or you wish people know about?

Do let the Dev.to community know!

原文链接：Which eclipse IDE shortcut/feature you wish you had known sooner?