Custom things
What's a hack
On Trinitycore a hack is a bad way to fix something (ie hand spawn one mob somewhere because spawn spell doesn't work) Also, changing WDB fields is a hack, never ever change one WDB field without a proper source (Sniff, retail cache) http://www.trinitycore.org/f/topic/58-wdb-fields/
How i apply a patch?
The best way is to use git apply /path/to/file.patch command if you get warnings you can simply ignore them, if you get error it will need to be updated. If you know a bit of coding you can use git apply /path/to/file.patch --reject and apply .rej code to the target files.
Don't bump patch threads asking to update a patch, duplicate update patch posts/topics will be deleted/closed.