Grammar fix

serious discussion

important talk

A conversation about something important, often needing careful thought or decisions.

collocationB1common

Hear it in context

Notice where the phrase sounds natural.

We need to have a serious discussion about our plans for next year.daily life
In my opinion, having a serious discussion with your boss can help solve problems at work.IELTS speaking

Pattern: have a serious discussion (about something) | get into a serious discussion

WrongWe did a serious discussion about money.

RightWe had a serious discussion about money.

You HAVE a discussion, not 'do' one.

Patternhave a serious discussion (about something) | get into a serious discussion

Choose the version that sounds natural in speech.

Stiff I would like to engage in a serious discussion with you regarding our future.

Natural We need to have a serious talk about where this is going.

In speech natives 'have a serious talk/chat'; 'engage in a serious discussion' is meeting-minutes formal.

Words that usually travel with it.

A 'casual discussion' is about less important topics and is more relaxed.