There are a series of basic steps you need to be familiar with when using QGIS:
- Loading Data into QGIS
- Filtering and subsetting Data
- Using simple analysis tools to spatially subset (Clip) data
- Save data for later use
- Styling/symbolising Data
- How to create a Map.
If you haven’t got QGIS I recommend you can follow this guide to installing QGIS.