I know how it works in general terms.

我大致知道其中的运作原理。

He spoke in very general terms.

他的话说得很笼统。

He only talked about it in general terms and didn't go into details.

他只是泛泛而谈，没有细说。

In general terms, the steps are.

一般而言，这些步骤是。

Do not use general terms.

不要用泛泛之词。