I added a new hook inside a module (hook_cart_commerce_pricecomponent_type_info_alter), which cache have to clear to only update that new hook? I mean i do not want to clear all caches.
Administration menu? Class registry? Menu? Page and else? Theme registry? Token registry? Update data?
hook_info
ormodule_implements
(or maybe both) in thecache_bootstrap
bin. You can't invalidate a single hook implementation (unless you alter the cache item manually) so the whole lot will be rebuilt on the next request.