I would tell a rather straightforward method.

If there are a couple of kml files, then they can be converted to shapefile in a manual way.

1. Just drag-drop kml in QGIS layer panel to open it.

2. Right-click layer name and "SAVE AS" shapefile.

3. Specify coordinate system

4. Save/Export

It is done.

I would tell a rather straightforward method.

If there are a couple of kml files, then they can be converted to shapefile in a manual way.

1. Just drag-drop kml in QGIS layer panel to open it;

2. Right-click layer name and "SAVE AS" shapefile;

3. Specify coordinate system; and

4. Save/Export