I just realize what people take for granted and make it easy to understand.
Everybody in Swizzerland-Austria knows how to sky. Kids learn so soon they do not remember when they learned like most people do with learning to walk memories.
In some Pacific islands they learn to dive. In New Zealand they learn to sail. In Japan or Spain people eat fish by tradition, in most Argentina it is a strange thing to do, you eat meat.
People on HN are mostly hackers, programmers, using a command line, what is a parser is or how to program is obvious for them, but is very strange to general population.
What is normal to us, is very strange to other people raised under other circumstances.
Learn about your audience. Use parables like Jesus to explain what they don't know with things they know very well.