To help with this, there is plenty of documentation available. In addition to the User Guide and Internals Manual included in the GDB distribution, the GDB Wiki also contains substantial information. If you are looking for a project then check the Project Ideas page.

If you write a change to the GDB codebase we encourage you to distribute the change yourself. You may also want to submit your change so that can be considered for inclusion in a future version of GDB. If so then there are certain legal requirements and style issues which all contributors need to be aware of - for more details please read the Contribution Checklist.