How many (max) types of fonts should be used in CV?

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#1

How many (max) types of fonts should be used in CV?

#2

Font type should remain same but it’s size can vary. Headings should be in bold and in large size font. Subheadings should be a bit larger than normal font. You can use bold font if you want to highlight something. Using too many font types would not be clean

#3

Only one font type and size.
Use bold words to highlight important aspects.