You can install a new WordPress theme without having any technical knowledge. It is so easy and automated.
Steps to install a New WordPress Theme
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Log in to the WordPress dashboard.
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From the Dashboard menu, go to Appearance and click on Themes.

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Click on Add New Theme.

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You can search for a theme using the search bar or browse the themes, choosing from Favorites, Popular, and Latest.
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Hover your mouse over the theme you like and choose Install.

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Click Activate on the newly installed theme.

Congratulations, you have installed and activated a new theme on your blog.