I don't know anything about computers.

我对计算机一窍不通。

youdao

Not all attackers are hackers — some attackers don't know anything about computers.

并非所有攻击者都是黑客-有些攻击者根本不了解计算机。

youdao

I'm a fast learner: I didn't know anything about computers before university, it was difficult at first but I studied hard, got high marks and can use it effectively now...

我学习能力很强。在大学前我不懂电脑，对我来说，起初很困难，但我用功学习电脑并且得到了高分，所以现在对电脑驾轻就熟。

youdao