OCAD offers you learn videos for various subjects. They help you to learn step by step how to use the functions. If there is an OCAD tutorial video for a specific subject area in this manual, you can open it by clicking its link in this document. Example exercises are available for most of the tutorial videos and can be downloaded from http://www.ocad.com/en/support/learn-video/. The tutorial videos and example exercises are available in English only. Many videos are made with earlier versions of OCAD. Functions or dialog boxes may have changed. Look for the OCAD Wiki article on the corresponding function to get help for the most recent version of OCAD. The following terms from the disciplines of geospatial technology, computer science and cartography, are used in this manual. An explanation of the most important terms is provided here to keep the explanations as short as possible and avoid any possible misunderstanding. Source.