Is there a way to create metatags (title, description, and keywords)?
Not from the theme, search for third-party plugins in the web
Can’t we change meta title and description from the wordpress cms?
No, such a thing is not possible from the WordPress without template files customization, if you are comfortable with php and web development then you can do such things but if no you have to find plugins
But i remember changing meta tags from wordpress cms maybe about an year ago.
Good evening alex
Most probably you are asking for something else check it again, also, if its WordPress core function then t should in WordPress, so you have to check it in the WordPress again