This is a tutorial on how to correct invalid geometry in QGIS without the use of the Geometry Checker plugin. With that plugin, you can use a tool called "Fix Geometries". In this tutorial, we use tools such as Check Validity, Buffer, and Union instead.
Data Source:
https://www.nhgeodata.unh.edu/
Land Use 2015 and Base Layers
Created By: Jacob Goodwin, Community Development UVM '23