There is an extension Geocoder which you can install on Google Sheets, and it will automatically output the coordinates of all cities listed. Be careful, though, because it can sometimes output incorrect coordinates for a non-unique city name.
If you want to make a more custom map, definitely read the SVG Guide. That's how I learned
When you click the "Draw Dots" button on the dot placer, you will see another column of text appear at the end; it'll be something like "cairo" or "los-angeles". Those are called the path IDs. Then, after uploading your SVG, go to step 2 in the quiz editor. In the hint column, add each ID in the row of the corresponding city.
If you want to make a more custom map, definitely read the SVG Guide. That's how I learned
When you click the "Draw Dots" button on the dot placer, you will see another column of text appear at the end; it'll be something like "cairo" or "los-angeles". Those are called the path IDs. Then, after uploading your SVG, go to step 2 in the quiz editor. In the hint column, add each ID in the row of the corresponding city.