I have a module I wrote that is used on a production site. I had to make some changes and need to update the module.
Where do I begin to learn to do this?
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"Updating a module" can comprise of two things:
On a related note, if your custom code is generic enough to be of use to the rest of the community, you can post it as a Drupal project and leverage drupal.org's project management feature which comes with git access.
You should also test everything out on a development server rather than on the production site. Adding lots of documentation to your update functions as well as maintaining a CHANGELOG.txt is also recommended.