This is a very basic question. Word uses styles in a very similar manner to Indesign. Both have paragraph and character styles. I haven't used Quark for over 25 years but it was similar to Pagemaker and Word back in those days too.

There are plenty of tutorials online and you can easily do a google search to find useful resources to help you learn about showing, applying and modifying styles in many of those.

Let us know if you need specific styles knowledge rather than something general in nature.

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Andrew Lockton
Chrysalis Design, Melbourne Australia