First bit of feedback -- it seems strange you haven't mentioned LXD/LXC containerisation as a Docker alternative. I looked at Docker, but went LXD/LXC for ease of setup, deployment, relocation. I know Docker suits many folks, but others will have their needs better met with LXD/LXC, so for your second edition, I could modestly recommend you give it a mention.
First bit of feedback -- it seems strange you haven't mentioned LXD/LXC containerisation as a Docker alternative. I looked at Docker, but went LXD/LXC for ease of setup, deployment, relocation. I know Docker suits many folks, but others will have their needs better met with LXD/LXC, so for your second edition, I could modestly recommend you give it a mention.