how do I check the number of installed tools in Kali Linux code example

Example 1: How do I see which version of Swift I'm using

// Open the Terminal and write:

swift -version

Example 2: what Permissions do I need for include folder on php

Directories must have execute permissions to be usable;
Usually this is 0755.
PHP scripts run via mod_php are not executed but rather read;
0644 will suffice for this.