site does not open without WWW / redirects to domain.com/wordpress

Hello,
I have attempted to install WP a few times on my website. The reason i installed and removed it over and over ( I’m new at this ) is that the site url kept showing /wordpress at the end – domain.com/wordpress, and at domain.com all i got was the index which I obviously dont want people to see.
Then I used this redirect command in my htaccess file, something like
RewriteEngine On
RewriteCond %{HTTP_HOST} ^(www.)?YourDomain.com$
RewriteRule ^(/)?$ blog [L]
which messed up big time! ??
Now i have installed it for one last time ( and i installed it directly on the root folder so I won’t have /wordpress url again!)
The problem now is that the site gives an error “The requested URL /wordpress/ was not found on this server.Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.” when I type domain.com (without www) and is redirected to domain.com/wordpress.
So perhaps I have messed up my htaccess file? I tried after removing the commands in it but its still the same error!
Can anyone understand what went wrong Or should I just reinstall the whole website? I really dont want to do that again!
Help!

But the site works fine with the url https://www.domain.com.

Thanks