How to make a simple graph?

I only need a simple graph with
Column C to be the x-axis
And Column O to be the y-axis
But everything seems very complicated.
Can someone give me
a point by point description to give me such a graph ?
Thanks in advance !

Select values only of C and O /axis/ column, then start the Chart Assistant, use XY (Scatter). - See attached sample file.

Starting with @Grantler’s sample file, while holding down the CTRL key, click where it says C above the column and click where it says O above the column. The locations to click are circled in red below.

image description

Now go to Insert → Chart for the Chart Wizard.

Grantler used options Lines only and Line type Smooth.

After the chart is created, double-click on the X-axis and adjust Scale and Label settings. It may take two tries to double-click on it, as selecting parts of the graph is tricky.

Hello thanks for answering!
I have now turned the Calc to English to find what you try to show me.
But I can still not find a way to do this.
That was the reason I beg for a point by point description.

Where do I select only C and O axis ?

Where do I start the Chart Assistant ?

I only find Insert Chart.
And if it is Insert chart I have tried a right-click on your diagram to see what you have chosed.
Preliminary I have only see your nice little graph (that is what I am searching for).

I selected the values of column C and O - use the CTRL key to mark different parts of the sheet.

Then I started (icon Insert Chart) to insert the chart and chose XY (Scatter).

More information see here: Inserting Charts - LibreOffice Help

I shall try to read and some videos because it still isnt obvious. I dont know how to use CTRL to mark 2 different columns
My way was hiding columns to get them side by side and highlight.
The main problem now is how to let C column be the x-Axis and O the y.
Now both is y.
If somebody can tell me that I think I will manage to get a little graph view of what I want to see.
And so I will read and see videos to learn how to use it better.

Upload an anonymized sample file for better working. There are loads of upload companies around the net…

Answers should only be used for answers to the question. In the future, add comments or edit the question instead. See guidelines for asking.