Feature extraction based on location (QGIS, GIS)

In this video tutorial, I will tell you how to extract features based on location in QGIS. Feature extraction means extracting and creating a new GIS vector data layer based on certain conditions. It can be based on the attribute or location. In this tutorial we will learn:
1. Extracting features based on attribute
2. Extracting features inside a polygon
3. Clipping features to polygon vector data.