Basic Tinkercad Extruding for Begginers

I will be showing You, how to make a perfect extrude

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Start By dragging A simple square, then resize to make it a little bigger.

Get a striped Cylinder. then resize it to make it just smaller than the square.

Place the Cylinder in the middle of the square. You may have to make the Cylinder a little taller.

Select both items, using (Ctrl-A) Then in the upper-right-hand corner, click the button named Group, which will then create the Hole.

your project should like this picture when you have finished.