You can visit the FTP site and download census tracts shapefile for California. US Census Bureau provides TIGER/Line Shapefiles. Loading CSV files that do not contain any geometry in QGIS. We will use a shapefile of census tracts for California and population data table from US Census Bureau to create a population density map for california. This operation is known as a Table Join and is done using the Join attributes by field value Processing algorithm. Often the data would come as a table or a spreadsheet and you would need to link it with your existing spatial data for use in your analysis. Not every dataset you want to use comes in spatial format.
Sampling Raster Data using Points or Polygons (QGIS3).Georeferencing Topo Sheets and Scanned Maps (QGIS3).
Basic Raster Styling and Analysis (QGIS3).Calculating Line Lengths and Statistics (QGIS3).Importing Spreadsheets or CSV files (QGIS3).