Visual guide to SSH tunnels

This page explains use cases and examples of SSH tunnels while visually presenting the traffic flows.

(Note that you need to scroll down a little to see the actual SSH command examples).
Source: Visual guide to SSH tunnels

OpenSSH Tip: Check Syntax Errors before Restarting SSHD Server

This page explains how to check the OpenSSH sshd server configuration file for syntax errors under Linux/Unix using the command-line option.

Source: OpenSSH Tip: Check Syntax Errors before Restarting SSHD Server – nixCraft

Small SSH config change becomes a massive time saver when using a jump (bastion) host

By using ProxyJump in your config on your local SSH client, you can save a lot of time when using a SSH jump (bastion) server before connecting to the target server.

Source: Small SSH config change becomes a massive time saver when using a jump (bastion) host (Claudio Kuenzler)

5 Best PDF editors for Ubuntu and Other Linux

A list of best PDF editors to edit PDF files in Ubuntu and other Linux distributions, including their advantages and features.

Source: 5 Best PDF editors for Ubuntu and Other Linux