I’ve used Obsidian to take private notes using Markdown. Also thought of this:

My son 🙋‍♂️was SO cute today, he asked me “dad are clouds candy?” 😍 I told him they were water. 💦 Then he asked “Dad, what’s the Earth’s defense system?” and then I remembered I don’t have a son and he asked again with his eyes obsidian black “what is the defense system father”