Start a line with a hash character # to set a heading. Organize your remarks with subheadings by starting a line with additional hash characters, for example ####. Up to six levels of headings are supported.
Alternatively, on the line below the text, add any number of == characters for heading level 1 or -- characters for heading level 2.
Best practices: Markdown doesn't agree on how to handle a missing space between the number signs # and the heading name. For compatibility, always put a space between the number signs and the heading name.