Optimum way of charging apple devices?
That article is focusing on the possible dangers of starting a fire if not original components are used.

Now you can ignore it and continue using non apple hardware at your own risk (usually small but it can happen), or use OEM hardware that is designed to prevent overheating (over-current) and it will shut down before serious stuff occurs.

Definitely do not put it under your pillow while charging or in any case allowing it to radiate the heat generated.

The points 2, 3, and 4 are correct.