Ask What are the best typography choices for a membership site?

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I'm designing a membership site and focusing on typography. I want my site to be readable and visually appealing. I've seen sites using fonts like Arial and Helvetica. I'm considering using bold fonts for headings. I've also heard about using sans-serif fonts for digital content. I'm looking for fonts that work well on both desktop and mobile. I want to create a consistent look across my site. What are the best typography choices for a membership site?