# Basic Osclass

- [Contribute to Osclass](/osclass-docs/v3.9.0/developers/basic-osclass/contribute-to-osclass.md)
- [Coding Style](/osclass-docs/v3.9.0/developers/basic-osclass/coding-style.md): Basic Introduction to Osclass coding style
- [Debug PHP Errors](/osclass-docs/v3.9.0/developers/basic-osclass/debug-php-errors.md)
- [Debug SQL Queries](/osclass-docs/v3.9.0/developers/basic-osclass/debug-sql-queries.md)
- [How to write a bug report](/osclass-docs/v3.9.0/developers/basic-osclass/how-to-write-a-bug-report.md)
- [Database model and diagram](/osclass-docs/v3.9.0/developers/basic-osclass/database-model-and-diagram.md)