Free platform to use to create a complete website?

Can anyone advise me which free platform to use to create a complete website?

Wordpress. You can get a quality free theme on their platform or google and customize it as per your requirements.

Unfortunately, I recently entered this world and I don't have the perfect terminologies.
In practice I used altervista for a site and edited with wordpress, can you confirm that there are all the features to insert banners etc? ... thanks