Hudson QGIS

[Kevinstat]

Okay, I've done all that now.  The color (randomly?) chosen for my shapefile lines is yellow and the scale is 1:16,631 (I might have done something in the beginning that caused it to zoom out a bit), but otherwise my map looks like that image.

I saved my project after completing the last task and am ready for my next lesson, if there are any more to come.

[Kevinstat]

Okay, I've done all that, except for 11.  And 12 technically, as I had no expressions I guess, but I did select all which is in that same "icon menu", plus tried the "invert selections" icon which was the same as select all when I had nothing selected, and the same as clearing all selections after I had selected everything, as one would expect.

[Kevinstat]

The shapefiles for the Census Bureau's prototype blocks in Columbia County, as well as those for their 2010 blocks (tabblock2010, as well as the locally identical tabblock) don't show any of the Hudson Correctional Facility lines you want to delete as actual/planned block boundaries, while the "Vermont Avenue" table suggests that most of them were block boundaries in 2010, and many of them are boundaries of the Census Bureau's prototype blocks for 2020.  (I added those shapefiles to the project yesterday.)  Did the Census Bureau mess up with their shapefiles or something, or is there probably some error on my part?

Otherwise, I followed and understood everything in your two posts.