The game begins, let's go!
As for why one could display their skills immediately after reincarnating and even achieve such great success in the fields of magic and magic potions, it was merely due to information asymmetry.
Just like scientific research in a previous life, whether it's magic or magic potions, in the vast majority of cases, a lot of trial and error is often required to distill something valuable from the vast ocean of theories.
Setting aside Kael's research abilities, he had an absolute advantage in this regard; he knew the development directions of certain professional skills, types of magic potions, and spell categories.
After his memory enhancement was obtained through his professional traits, he could recall many snippets of information he had glimpsed in his previous life.
These bits of information were not enough to grant him new skills, unlock new magic potion formulas, or carve out new research domains.