FabioMilitoPagliara said:what I would like to know is
how many recipe can a character know?
how many rituals?
will it be linked to stat or level or feat or all of them?
Might have changed since, but from what I understand, there is supposed to be no hard limit to the number of rituals that a character can learn.
Some rituals are one-shot (scrolls are no longer a normal spell charge, but allow to cast one ritual once), while books can allow you to learn fully the corresponding ritual (you can cast it as often os you wish, but of course each casting will probably require some times (maybe hours or days for some rituals) and components (gold cost, or maybe some rare component such as dragon scale that the DM could easily limit in game to prevent a ritual from being abused)))