For example, if you've made a mistake at work and you tell your colleague,

比如說，如果你在工作中出了差錯，你對同事吐露了這件事

your colleague might say, "Don't worry, it's no big deal." That means there's nothing to worry about.

你的同事可能會說：「別擔心，沒什麼大不了的」這表示沒什麼好煩惱的

So, if you'd like to use this expression in your everyday language but you've forgotten,

所以囉，如果你想在日常生活中使用這樣的說法，但竟然忘記了

don't worry, it's no big deal, simply watch the video again.

放心吧，無所謂，把這部影片再看一次就行了