Just felt like posting this here because it's something that apparently some people don't know about, and I have no idea how I would work in Unity without it.

When messages show up in the Console, if you select a message, the window beneath the console will show the complete call stack, with line numbers for where the call occurred. Line-by-line debugging in Unity sucks, so this is the next best thing.

This has loads of applications beyond finding the lines causing bugs. If you want to know where a variable is being modified from, you can wrap it in a C# Property, then make the variable private so it can only be accessed via the property, then put a Debug.Log() in the property's Get function.

In my honest opinion the worst thing about Unity is that it gets touted as being usable to people with no programming experience. Because it sort of is, you can definitely make stuff work with only a beginner level of coding knowledge, but unless you've got an actual background in programming, a lot of stuff is going to be completely invisible to you, especially when things go wrong.