Knowledge bases are invaluable if you can keep them up-to-date and relevant, most people like the ability to find the answer themselves (count the number of times you’ve googled something).

It also will release pressure on your ticket/live support and reduce the time the client has to wait for an answer. Try to include common issues but anything that crops up that is easily answered throw in for good measure however make sure the search feature and titles are relevant as in “how do i ...?” or “can i do ... ?”