Need help with finding programming resources


I'm new to sugarCRM, however, I'm a PHP developer and used to working with PHP frameworks.  A colleague asked me to make some modifications to a couple of different modules and I thought it would be fairly simple.  But I'm finding it difficult to find basic tutorials on how to do stuff and the only resource I've found is the massive 740 page developer documentation.  Is there a good resource for tutorials on how to do basic stuff in sugar?  We're working with the most current version of the community version.  Thanks for the help.