Basic WordPress Theme Overview In WordPress For Beginners
So now your site will open, and this is how it will look like now from WordPress, go to appearance and select themes from here here. You can see all your themes and add new theme from here, or from this top add new button.
You can search installed themes from this search bar now open one theme from here, and you can delete it from this button. Also, you can see its live preview on your site and activate it from here as well.
So this is how the WordPress themes work.
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