How Gonggo produce and use his web...
This is also work on his both feet...

Web on hands use to fighting, hunt, crawling and swing between tree and branch.
Web on feet use to bungee jump and/or safety equipment while jumping or he can use it to leave a trail so he cannot to get lost.

He also can jump over 5-7x time of his height...

imagine when he want to cross over 20 meters gap between the tree, he hold the rock on his hand, prepare his web on it. then he jump up over 9 meter and throw a rock cover by web to the next tree branch. viola, he made a bridge for himself and run over it. If he missed his trow he still safe cause he has web linked on his feet.