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There are five levels of headings and subheadings. Headings with the same value should be in the same style. The number of headings will depend on your paper. Always begin with level one, and proceed to level two, etc. Heading Levels Template: Student Paper (pdf) will give you an idea of how your paper should look.
Centered, Boldface, Uppercase and Lowercase Heading[1] (level 1)
Your paragraph begins below and is indented like a regular paragraph.
Flush Left, Boldface, Uppercase and Lowercase Heading. (level 2)
Your paragraph begins below and is indented like a regular paragraph.
Indented, boldface, lowercase paragraph heading ending with a period.[2] (level 3) Your text begins after the period.
Indented, boldface, italicized, lowercase paragraph heading ending with a period. (level 4) Your text begins after the period.
Indented, italicized, lowercase paragraph heading ending with a period. (level 5) Your text begins after the period.
(American Psychological Association, 2020, pp. 43-48, 61-67)