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The essentials
Every guide in this topic
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What is a port number?
If an IP address finds the server, the port finds the right program on it. The common ports, and how to see which ones…
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How HTTPS works
What the padlock actually means, what a certificate proves, and what happens in the first fraction of a second of every secure connection.
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What is an IP address? IPv4 and IPv6 explained
The number every device on the internet uses to find every other device, the difference between IPv4 and IPv6, and public versus private addresses.
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What is a reverse proxy?
A server that stands in front of your other servers, takes every request and decides who answers. What it does, when you need one,…