Documentation
After you downloaded CUBRID files from http://www.cubrid.org/downloads, here are detailed documentation you can refer to.
Tutorials
If you are new, you can get started with these tutorials which cover How to install and to build, Configurations, Development tips, Admistration tips and CUBRID Architecture and concepts.
http://www.cubrid.org/tutorials
Manual References
CUBRID Manuals is a superset of tutorials. They consist of chapters as following: Introduction, Getting Started, CSQL Interpreter, CUBRID SQL guide, Administration guide, Performance tuning, API references, and CUBRID Manager guide.
Release Notes
If you consider version updates or look for new features and fixed bugs of a specific version, you'd better to read CUBRID release notes. The link also contains QA test reports having perfermance comparison between the latest version and the previous version.
http://www.cubrid.org/release_notes
Wiki Articles
CUBRID wiki pages are for collaboration and instant documentation of CUBRID Tools and Drivers projects. They contains specification documents, change note(or release note), and unit test results.
http://www.cubrid.org/wiki_tools
http://www.cubrid.org/wiki_apis
Video Trainings
CUBRID provides video tutorials for your first step to CUBRID. They contain How to use CUBRID Manager to create DBs and Tables, and to execute SQLs.
http://www.cubrid.org/video_trainings
Other Resources
CUBRID Blog covers various topics of technical articles including trendy news, NoSQL, database or storage related articles, and other opensource products.
Visit these online resources and read our documentation.
If you still have questions, do not hesitate to post them to @cubrid Twitter, CUBRID Facebook wall, or to CUBRID Forum
More tutorials are available at http://www.cubrid.org/tutorials.