How do you use the microtype package to fix underfull/overfull warnings?

[dawn ridge]

emily
Compile Error! Click the reaction for more information.
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[eternal elm]

Don't use \\\\

It is a nonsensical construction

Separate paragraphs with blank lines in your source code. If you want vertical separation between paragraphs, put \usepackage{parskip} in your preamble.