It is impossible to insert radar chart without data, so for the success of inserting the radar chart, we are going to start with outlaying the data.
Your data can look like this:
You must mark all the data, in this case I am marking cells from A3 to E8.
Click on insert (1), and then on radar symbol (2), and one of the radar charts (3).
Note: You are still inserting a radar chart, if you see things like polar chart.
Our Radar Chart: