Correct and better way to customize wordpress theme or/and plugins without lose my changes after un update

i have a theme or a plugin, and i decided to edit it. My trouble is that when i update it (for example the theme's author release an update) i lose my changes, because the update overwrite the theme files (or plugin files). What is the solution ? Child Theme for the theme ? How works it ? And for Plugins ? Thanks


As you mentioned, I would set up a child theme.

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