What is the best way to create a heading in a document?

The answer to this is applying a heading style. Any of the given choices can be done when you want to create a heading but if you want to create a heading that is more formal, this may be the best option available for you. There are different heading styles that are available and you can just choose depending on what you think will be the most effective for your needs.

There is a heading style that is very big but there are also some heading styles that are not too overpowering. It will depend on you which one will be the most effective depending on your needs. Simply applying bold formatting may not be enough for you.