You’ll have to give a little more explanation.
But I think that the problem is that you are using get_template_directory_uri() as an anchor link. What get_template_directory_uri() does is to give you the URL of your theme, for instance you can get your “/assets/images” folder like this.
If your site structure is “theme_folder/page1.php” then I recommend you to better use a Page template
Page templates let you create a new page from WP Admin and have an specific design of yours.