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You can use Simplify Geometries under Vector ==> Geometry Tools. Depending on what value you select for your Simplify tolerance and what type of data is in your shapefile, the operation may render yo …

You may have used the tool that generates nodes for intersecting features on different layers. For what you describe Vector -> Geometry Tools -> Check Geometry Validity may work for you. While you may …

Save your map as something like png or jpeg that you can later bring into QGIS. Use the georeferencer plugin tool to georeference the map in QGIS. … It helps to start with a background map of the area you are interested in QGIS, Open Street Map for example. …

The tool you are looking for is select by location under: Vector => Research Tools => Select by Location with settings as in the image below. The zipcode layers goes in the first dropdown and the c …

Are you able to query on perimeter length? The more detailed, the longer the perimeter and hence "better". Here is a link that could be helpful:

One way to achieve this is to run (Vector geometry tools/Delaunay triangulation) in QGIS. You can then delete the triangles that fall outside of your desired boundary. …

Create a subset of polygons i.e a new shapefile with the intersect tool with your polygon layer as Input Vector Layer and your lines as intersect layer. Save and add the new shapefile to the layer pan …