I want to increase the security features of my home preferably concerntrating on the door and windows. Advice?

I would like to increase my homes security. Preferably with new doors (I've been considering timber faced steel) and windows. I've currently got bog standard upvc but would like to know if anyone knows of any other products that have stronger glass in them (not that ugly security glass).
Thanks

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).