Delete 'Unused' Files in Project Panel

Hello there!

Scenario: I am learning about dependencies and collecting files. This helpful tutorial advises to organize project files first.

 https://www.youtube.com/watch?v=nDKmAjREqrM

Question: Would it be wise to type in 'Unused', then delete those which appear before organizing? 

Figure 1. Project Panel after typing 'Unused'

Thank you much, 

One&Done