Selecting tools are very important in all the GIS because, among other things, there are a lot of tools that are executed on selected elements. Besides they can be useful to locate elements with specified characteristics easily.
Before starting we remember that, as we saw in the post about Tables, where we select elements of a layer they are selected on its attribute table too (and vice versa).
Selecting tools can be found at the “Selection” menu or in the corresponding button:





