If you want to introduce less technically-inclined friends to the fediverse, don’t overload them with information about how the fediverse works.
Simply tell them to find a community they like, or better yet, if you know what they’re into find an appropriate instance for them, and also tell them not to worry about anything else. The way fediverse works is better shown rather than explained.
For example, I recommended squawk.social to a friend of mine with a birdsona, and he said he’ll consider signing up.