Topics

Start from the job you want to do. Each guide is one page in four parts, so you can stop at the part you need.

Part	Level	What it holds
In one minute	Beginner	what it is for, in plain words
Do it	Intermediate	the commands, copy and run
Expert	Expert	every algorithm and its standard, the implementations, common mistakes, best practices
Now and next	Expert: the latest research	what changed lately and what is coming, with the date it was checked

Each guide stays short and links to the Book for the why and to the Algorithms pages for the details.

Guides

Guide	The job
SSH	log in to a server, use Git over SSH, make and manage SSH keys
HTTPS and certificates	the padlock in the browser; certificates for your own server
Passwords	choose them well; store them safely in your software
Encrypting files	lock a file, a folder or a disk
Moving to post-quantum	what quantum computers break, and what to do now