Comment by dranka

If you are working on an old code base for a reasonable time I recommend to get to know the old developers. Check out the commit history, who wrote what, talk with them a bit if they are still around to get a feel for them. After a while you will probably see patterns, guy A usually wrote solid code, guy B a bit more sloppy. If you are investigating a bug in a specific area of the code use git blame and start investigating any additions by guy B first