Good websites to improve your aviation knowledge?

I am interested in aviation. Do you know any good websites to improve my knowledge on the subject? I don't mean looking up every type and model of airplanes in google... Thanks in advance!

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…).