I'm looking for suggestions, resources to learn advance customisation of WordPress themes. Do you have any?
Advanced customisation of WordPress themes is coming with more functionality.
wordpress? is that thing still alive?... crap
This youtube video is a beginners' tutorial for building your own wordpress themes, if that's what you meant.
If you're quite new to wordpress, I would also suggest to take a look at Wix - which is essentially the same as wordpress.
Tried to build one a while ago but didn't have the time ... and it's no longer required.
Start reading https://codex.wordpress.org/Theme_Development