Have you ever heard the idiom?

It's not rocket science.

This idiom means it's not complicated.

How common is this idiom?

It's used quite a bit.

I looked it up on your English and saw 352 examples in American English.

Here's an example of when I might use it.

I used to live in New York City, and I remember my mom visited me, and she was intimidated by taking the subway by herself.

I said, Mom, it's not rocket science.

There are signs everywhere and I'll give you a map.

It's not that complicated.

That's it.

It's not rocket science for very simple steps that you can use to learn anything.

It's not rocket science.

These tools are obvious, and people want them.

What do you think?

Are you going to be able to use the city?

Um, I think you can.

It's pretty easy.