Tips and tricks to debug in Unity:
Anyone else has some wisdom to share? 
Yes, debugging via code
That’s a good article, especially the mentions of Test Driven Design and inspector Debug mode.
I wanted to add that you can use rich text in the console, which allows you to color-code log messages:
Debug.Log("<color=yellow>AI message: Acquiring new target</color>", this);
Debug.Log("<color=cyan>Network message: Lost connection to server</color>", this);
Also: 50 Tips for Working with Unity (Best Practices) – Dev.Mag
This is an older article, but it’s still very valid. The section on Testing and Debugging, such as graphical loggers and HTML loggers, are particularly relevant to this thread.
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When in doubt print it out!
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This is pretty complete… Debug.Log prints and temporary public inspector variables to save you time.
Two huge ones for me… Keep your LOGS clean!!! Then you can just toss in a print or debug and fined them right away, rather than sift thru 10000 lines to find what your looking for. I had an art teacher that told me once make your change then remove. Works for coding I will copy a line of code rem one out and then make my changes. That way if I mess it up more, need to see what I did last time etc… it is right there. You can all ways remove them later.
I’ve also just started using a asset called rock info… Works great for the fps I’m developing as I can give each bot it’s own channel etc…
Wow, I didn´t know that! Definitively a must when creating Debugging messages for another person 
That’s very colourful indeed