Follow the KC3 Installation Guide to install KC3 locally from sources.
Follow the KC3 Testing Guide to verify that your KC3 installation is correct. The test infrastructure contains hundreds of thousands of test assertions each checking that your local version of KC3 is OK.
Follow the KC3 Usage Guide to find out how to use KC3 in details and effectively.
Follow the KC3 Structure Guide to discover the structure of the whole KC3 project and its components.
Follow the KC3 Tutorial Guide to learn about developping software in KC3.