Spelling and Grammar
You can use the gear menu->Proofing submenu to start checking spelling ⌘+;, and opt to also check for grammar suggestions ⇧+⌘+;.
To navigate errors, use ⌥+⌘+; (next) and ⌥+⇧+⌘+; (previous).
Click the marker on the left to see details about the error, including suggestions for fixing.
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