In visual studio how to select word in text editor using keyboard

In Tools | Options | Environment | Keyboard enter "Word" into "Show commands containing" and see all commands associated with words.

Here the command Edit.SelectCurrentWord is assigned to Ctrl + W, but your setup might be different. Ctrl + Shift + W is another common setting.

In Visual Studio 2019 the default keypress to select a word is:

Ctrl + Shift + W

When using Resharper 'Shift + Ctrl + W' shortcut may be overriden and not working. Create new shortcut for Edit.SelectCurrentWord as 'Ctrl + W, Ctrl + W'. It works fine so you may use this and resharper shortcuts.