Why the words became blue

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Why the words with ### become blue and there is no color on other words?
I do not know what bottom I pressed. Thank you for your help!

That it just markdown mode turned on in the cell where you see blue text. It is in the edit mode & so it isn’t rendering the text as markdown style yet. If you hit shift-return, it will render the blue text as headings.

To put it back to code mode, click on that cell and use the Cell menu across the top of your notebook and select Cell Type > Code. Alternatively, there is a convenience menu on the icon tool bar that lets you use a dropdown menu to dial the cell type to Code.

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Thank you for your help! ^ ^ Have a nice day :smiley: