WordPress adding custom fields into post’s front end

i want to make a wordpress plugin that will display some content at the end of each post. let’s say for example ‘Hello world’.
But looking at the wordpress API, i don’t find any relevant indications about how to do this.

i don’t want a widget, but only a plugin that does only that: displays me a static text at the end of every article.

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any idea about how this should be done?

thanks!

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