Hi,
What kind of websites I can create using this PHP? Can it be used with the HTML code like Microsoft’s ASP? Is it easy? Can I test its code with Microsoft IIS?

PHP is a powerful server-side scripting language for creating dynamic and interactive websites.

Yes, PHP can be embedded directly into the HTML code. It is widely-used, free, and efficient alternative to competitors such as Microsoft’s ASP. PHP is perfectly suited for Web development.
Yes, it is very easy, the PHP syntax is very similar to Perl and C. PHP is often used together with Apache (web server) on various operating systems.
Yes, you can test it with Microsoft’s IIS, it also supports ISAPI.