You provide very little information to go on. A 404 error indicates that the requested file was not found so my first guess would be that you cloned your git repository to the wrong location. The default apache web root is /var/www/html/ so if you wanted your content to be available at example.org/mycontent it would need to be placed in /var/www/html/mycontent on your droplet.

Another possible issue is if your permissions are not set properly. If you ran your git clone as the user root then your files would be owned by root and may not be readable by the web server (apache runs as the user "www-data"). You can use the following command to set the ownership of everything in your web root recursively.

chown -Rf www-data:www-data /var/www/html