The RHEL 7 book from OP is most certainly still relevant. For example, my department at work has not managed to switch over to the brand new RHEL 8 machines just yet.

The worst thing is: you can’t even put an int in a json file. Only doubles. For most people that is fine, since a double can function as a 32 bit int. But not when you are using 64 bit identifiers or timestamps.

I already saw this happening on Reddit. The largest subreddit were filled with generic posts. They got a lot of content, not necessarily good content. But there were plenty of small or medium sized subreddits that had much better content. The Fediverse feels like it is missing the big subreddits. It also feels too small to have the small niche subreddits. What is here in terms of content feels more like a few medium sized subreddits.

The peak linux experience.