Step-by-step guides and notes from things I actually ran into. Written so I can send someone a link instead of explaining it twice. Ok, kidding, they're a personal reminder…
Generating the right key, choosing between a personal key and a deploy key, adding a second repository to a server that already deploys one, and decoding the 'Repository not found' error that GitHub returns instead of a permission denial.
Finding the volume ID, growing an EBS volume from the web console or the CLI, then connecting over SSH to extend the partition and the filesystem — ext4 on Ubuntu, XFS on Amazon Linux — plus the NVMe naming, the 2 TiB MBR limit and the growpart failure nobody explains.
Installing Git, generating an SSH key, connecting it to GitHub, and every other way to authenticate — personal access tokens, the gh CLI, deploy keys for servers, and juggling two accounts on one machine.
Adding the official MongoDB repository, what WiredTiger does and why you no longer get to choose it, how to size its cache, and the configuration and OS tuning that matter in production.
Why apt gives you the wrong version, how to install Node with proper version management using nvm, fnm or NodeSource, and the systemd trap that catches everyone on their first deploy.
Setting up a WireGuard server with working IPv4 and IPv6, adding clients, tunnelling a single application instead of the whole machine, and fixing the Android Auto disconnections that VPNs cause.