Final answer:
To spoiler a message on Discord, type the message between two sets of vertical bars or highlight and right-click the text, selecting 'Mark as Spoiler'. This hides the content until it is clicked on by a user.
Step-by-step explanation:
To spoiler a message on Discord, you can use one of two methods. The first method is to wrap your text in bars (||). For example, typing ||This text will be spoilered|| will create a spoiler. The second method is to highlight the text you wish to spoiler, right-click, and choose 'Mark as Spoiler' from the context menu. This will automatically wrap the selected text with bars for you. Spoilers are a way to hide messages until someone chooses to view them, which is essential when discussing sensitive content or plot details that other users may not want to see immediately.
Learn more about spoiler a message on Discord