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Make sure you import FontAwesome correctly indented.
#Take the code from your font awesome
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If only some icons seem not to work is very likely you've imported
the wrong version of FontAwesome, try this:
<link
rel="stylesheet"
href="https://use.fontawesome.com/releases/v5.13.0/css/all.css"
integrity="sha384-Bfad6CLCknfcloXFOyFnlgtENryhrpZCe29RTifKEixXQZ38WheV+i/6YWSzkz3V"
crossorigin="anonymous"
/>
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@5.15.4/css/fontawesome.min.css" integrity="sha384-jLKHWM3JRmfMU0A5x5AkjWkw/EYfGUAGagvnfryNV3F9VqM98XiIH7VBGVoxVSc7" crossorigin="anonymous">
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Make sure you imported FontAwesome correctly:
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.13.0/css/all.css">