I taught kids how to code for several years, both in person and through a website that taught Python to ~500k kids. My eternal advice with teaching CS is to delay abstractions as long as possible. Teach them how to draw a circle on a canvas, then get them to move the circle to different parts of the canvas, then get them to draw multiple overlapping circles/rectangles/etc. Once you've got that down, make a bouncing ball animation, simple games, and so on. Most kids don't really care for leetcode problems these days, so it's best to stick to things that are visual, creative, and instant-feedback (i.e. games).

This was a really useful realization when I was teaching kids to code in person for ~5 years. I started off teaching Java with an abstraction layer (https://www.bluej.org/), but I found that many students would be intimidated by anything that ventured outside of the abstraction (e.g. just run `javac` on your computer with a `.java` file). My most successful students intuitively understood how to turn a text file on their computer into a useful piece of compiled code, or into a JAR bundle that they could share with others. They also used the various abstractions that were thoughtfully introduced over time - e.g. an IDE that gives you a run button, libraries like Firebase which enable some exciting multiplayer game options, and so on.