I am new to QGIS.
I would like to draw a boundary and a few polygons (to represent buildings or concreted areas) on a map for planning out a farm soil delineation map (with some irrigation). I was planning on drawing polylines to include pathways and rivers.
I wanted the map to display the surrounding roads, so I tried to include some map information using the instructions from the following tutorial.
Using another online resource, I then tried to draw polygons using Shapefile layer.
However, I am facing an obstacle now as the method provided works for drawing one polygon only. When I try to create any additional polygon or layer with new polygons, I get an error message saying there are duplicate nodes.
Searching online, there is a lack of useful information or guidance to explain what is going wrong.
What is going wrong?