Troubleshooting Steps - Build Error

I'm running into this issue quite often where I have a Build failure.  I'm sure to others the way to troubleshoot what the issue is may be obvious, but being fairly new to this, what are the steps to try to remedy this?  What are the highlighted areas actually telling me?  Using VS Code version 1.91.1

When I run into this, I usually have to back out changes and start over, but is there a better way to troubleshoot this?  Here is the output in VS Code in PDF.  

Executing task.pdf

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