I am using Fedora 6. When I try to update, I get the following error:

Error resolving dependencies.

missing dependency: gecko-libs=1.8.07 is needed by package yelp

Two questions:

1) What do I need to do in order to update?

2) Is there a manual that explains 'stuff-and-things', so I can try to trouble shoot problems before going on line?

Generally, problems like this are caused by a repository in the process of being updated, or a bad update. Something depends on something else, but one of the pieces hasn't been placed on the server yet.

You can either wait and try the update again in a day or two, or you can tell yum to skip the broken piece:

yum --exclude=yelp --exclude=gecko-libs update

The above command will ignore updates for either yelp or gecko-libs, and see what other updates are available. The 'man yum' command will provide you with documentation on the yum command.