Good work – a 96% score and only 4 warnings!

From https://themecheck.org:

1. theme tags : Presence of bad theme tags. Found wrong tag custom-logo in style.css header.
2. Custom elements : Presence of custom header. No reference to custom header was found in the theme.
3. Date and time implementation : Use of the_date(). At least one hard coded date was found in the file template-parts.php. Function get_option( ‘date_format’ ) should be used instead.
4. Screenshot : Screenshot file. Bad screenshot file extension! File screenshot.png is not an actual JPG file. Detected type was : “image/png”.