Updating portage gentoo
Also, to avoid too many surprises, you might find it helpful to subscribe to one of the mailing lists like (WARNING: ~100 mails a day on this list) since pretty much any major update issues are likely to show up on the list with plenty of discussion explaining how to solve them.
Portage is based on the concept of ports collections.
then it checks the dependency tree for anything that also is due for updating, That doesn't mean FF needs the kernel updating, only that if you want to update everything that has an update ready that FF depends on, that that would include the kernel.
I like it, but I'm not sure I'd agree with the --keep-going on the world update.
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Search for updating portage gentoo:
(use --oneshot for things you don't want to add in to the world file, like system libs for example).