Installation, updates, general problem solving and assistance.
I haven't checked this out, but pretty cool concept:
There are these three use cases you can choose from:
Web Search by the people, for the people: decentralized, all users are equal, no central, no search request storage, shared index.
Your Search Portal
Your YaCy installation is independent from other peers. Define your own web index and starting your own web crawl.
Create a search portal for your intranet or web pages or your (shared) file system.