You may have heard that IntelliJ IDEA is a keyboard-centric IDE. What it means, is that you can work with it without touching the mouse ever, which helps you stay focused and in the end, to be more productive. This is why it’s very important to know IntelliJ IDEA keymap, that is, what keys and key combinations are mapped to what actions.
IntelliJ IDEA comes with a set of keymaps that have been specially adapted for use with different operating systems, and to ease the transition from other IDE and editors. For example, if you are a long time user of Eclipse or NetBeans, or an avid Emacs fan, you can find the keymap that is right for you. To select a keymap that you want to use, go to Settings → Keymap. Any keymap you choose can further be tailored to your specific habits, that is you can add your own key combinations and modify existing ones.