By default if you make use of TextEdit app to write, it will auto-correct your text by underlying misspelled text by a red line.
If you want to turn off autocorrect, follow the below steps.
- Open TextEdit App.
- Now go to menu: TextEdit -> Settings (Preferences if using MacOS prior to Ventura 13)
- Now be on the New Document tab,
- Under Options uncheck: "Check spelling as you type" and "Check grammar with spelling"
- If you do not want TextEdit to even correct your spelling also uncheck: "Correct spelling automatically"
- Close Settings.

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