Making polygons from lines (polyline to polygon) in QGIS?
139281
Making polygon from intersecting lines in QGIS using Polygonize or similar?
112098
Making polygons "complete" in QGIS?
126653
Creating collection of polygons from collection of points?
65113
Cut a polygon by a line
96640
How to Split Features in QGIS?
3202
Calculating polygon areas in QGIS?
9768
Selecting features within Polygon from another layer using QGIS?
23496
Splitting polygons with line grid in QGIS?
123411
Can I create a TIN from contours lines (shp) in QGIS?
21951
Creating rings from existing polygons using QGIS?
60715
How to get sum / total length of lines per polygon in QGIS?
50056
Dissolving ploygons in QGIS or Grass to new polygons of defined population sizes?
82524
Splitting all lines in layer at vertices using QGIS
76684
Splitting polygon into equal area polygons in QGIS 3
89894
Cropping Shapefiles in QGIS?
23257
Smoothing/generalizing polygon in QGIS?
28046
Create region from polygons and tangential line segments