Apache2 modules folder where is it?
Solution 1:
Be prepared to ditch a lot of what you know from Windows. In particular, to install the security2 module, install libapache2-mod-security2:
sudo apt-get install libapache2-mod-security2
The module shared library files go in /usr/lib/apache2/modules, not that you should use your own when there's a packaged version available.