Creating equally spaced points within shapefile with multiple polygons using QGIS?

Question

In QGIS 2.18. I have a vector shapefile with multiple polygons, all of these are squared and have their own attributes. Inside these polygons I will have more (small) polygons that will represent areas where it cannot be constructed.

I need to create as many points as possible within each square but excluding the inner polygons (mountains). The points should be equally spaced (i.e. 250 m) from each other and cannot be placed in the edge of the bigger polygon, necessarily have to be inside.

Answer 1

You can create those points using regular points tools in qgis. Unfortunately, it will create points inside the small polygons too. but you can select those points using select by location and delete them.