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@sethdrebitko If you're just starting out, don't worry about it too much! But it's considered bad practice for performance, a few of the reasons are outlined here developers.google.com/web/updates/2016/08/removing-document-write sorry I know this isn't the most beginner friendly explanation but hopefully it helps
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@sethdrebitko Ah this might be a bit more succinct: developers.google.com/web/tools/lighthouse/audits/document-write