Reviewing some of my earliest web projects: they have a mix of Postgres, MySQL and Mongo.
These days I just use sqlite for all my personal projects. It's really good at my scale and makes deploying very easier.
A surprising amount of important software functions by developers doing each other favours by reviewing pull requests.
I'm taking an amateur radio exam today and reviewing mock papers.
I'm struck that they explicitly teach people to ignore trolling! This is the first time I've heard official advice on dealing with troll behaviour. (The expected answer is D in both cases here.)