Hi Armin,
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H tags can have different fonts and sizes and this is usually controlled with the CSS on your Wordpress site. If you are not familiar with CSS, you might have two options. Higher end Wordpress themes, give you the ability to easily customize your font sizes in headings, body text, menus etc. If this is not available, being Wordpress is known to have a plugin for pretty much everything, you can try out the many font customization plugins to see which gives you the option to change heading sizes.
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Generally have only one H1 heading, as a page title, and then you can have multiple H2-5 tags
Hope this helps!
