Use pages instead of posts if you do not want author, date or other information to show. Pages only show a post title and content. Blog posts always show the post author and date. You can change the author to a generic “Staff” user or similar if there is no particular author. Blog and news posts should always show a date for the convenience of readers.
If you still want to remove date, author or other information, you will need to make a code customization using a child theme or custom CSS plugin.