What is the best winter clothing strategy for keeping warm and how do you dress warmly for winter?

In other words, what kinds of fabric keep you the warmest? Or what life hacks you can apply to make you warm? Or maybe there are some technologically advanced heated clothing alternatives?

What life hacks you can apply to make you warm? In example heated clothing, what kind of layers of fabric to use to keep you the warmest, own inventions, etc.

So in general, what is your best winter clothing strategy for keeping warm?