The nastiest typos are autocompleted similarly named (and correctly typed) variables, functions, or types. Which is why it's a good idea to avoid such name clashes in the first place. If this is impossible or not practical, at least put the part that differs at the start of the name.

Probably why they talked about looking at a stack trace, you'll see immediately that you made a typo in a variable's name or language keyword when compiling or executing.