I did some teaching at one time. I found that my presentations were best when I put myself in the student's shoes. By recalling what puzzled or interested me when I when I learned, I could select examples to best effect.

What are the hard parts? Anticipate the need to explain them and set up the lesson to emphasize them. Find three ways to explain them. Explain them in advance of using them.

What should they already know? Don't assume they fully understand even if they do know about something. Brief incidental reminders never hurt.

Examples should be short and as simple as possible. They should be as pure as possible. Avoid obfuscation or additional tricky bits.

What use is it? That question is always in the minds of students. Anticipate that, too. Examples should be extendable. Indicate how a code fragment might be used in other situations.

I can't claim to always follow my own advice. When I do I usually know I've done well.

After Compline,
Zaxo