Hey,

3) This is the file responsible for home slider items: wp-content/themes/planetshine-goodgame/theme/includes/vc-blocks/home-slider-item.php
5) Yes, you can. It’s explained in the docs. You have create a child class and override the method. see “Overriding theme PHP class methods” here: https://planetshine.net/support/topic/how-to-modifying-theme-with-wordpress-child-theme-2/
6) This looks unrelated to theme. There is a javascript error from weather atlas plugin. “Uncaught ReferenceError: wpColorPickerL10n is not defined”
7) Strange. If put [weather/] in there then it works. it might be something related to adrotate. did you try this shortcode in post text? Does that work?
8) See this: http://planetshine.net/docs/magellan-wp/#galleries

Should be ok now. There was an incompatibility with adrotate that I fixed with your ftp. I will add this to main theme next time we update.

5. Did you uncomment this child themes functions.php and insert the overriden method there? You do not replace the entire file. Just some of the methods. See: https://planetshine.net/support/topic/how-to-modifying-theme-with-wordpress-child-theme-2/

class MagellanChildTheme extends Magellan {
 
}

6 & 9. I see an error in browser console, but it’s all from wp core. The theme touches nothing here. And this works perfectly on my test store. Maybe it’s related to your advanced editor plugin or something similar to that? I don’t want to play football here, but I really don’t see this as a possible theme bug.

13. Footer fixed. Good catch.

Hey,

15) The featured tag is used in 2 places in theme and the URL can be set manually there.
wp-content/themes/planetshine-magellan/theme/templates/post-categories-compact.php
wp-content/themes/planetshine-magellan/theme/templates/post-categories-compact-dropdown.php

16) This might be what you are looking for in regards to category URL

WordPress. How to change “category” slug in website permalinks