I downloaded a theme using this link
How to used CSS js HTML same theme show in Magento 2.3 frontend side so please tell me what to do in theme integration
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Install a theme manually
To install a theme manually, you must have the theme’s code, either in a compressed archive or in a directory structure similar to the following:
<VendorName> ├── composer.json ├── etc │ └── view.xml ├── media ├── registration.php ├── theme.xml └── web ├── css │ └── source ├── fonts ├── images └── js
To install a theme manually:
Copy the theme’s code under /app/design/frontend for a storefront theme. Verify that the top-level directory is ; otherwise, the theme will not install properly.
cp -r ExampleTheme /app/design/frontend
Confirm the theme copied to the correct place.
Storefront theme: ls /app/design/frontend
Run the below commands to deploy your theme files
php bin/magento setup:upgrade // to install a theme to database php bin/magento s:s:d -f // deploy theme into pub/static php bin/magento cache:clean chmod -R 777 pub/static/* var/* generated/*
A sample follows:
Log in to the Magento Admin.
Click Content > Design > Themes.
The theme displays in the right pane. Configure it to your store and see it up in frontend.
Refer this link