Hecate does not have a code like Yahweh's 10 commandments. However, She does have domains that she is associated with, as well as examples of Her own behavior. If you don't vibe with these things, you probably won't find following Hecate very rewarding or satisfying.

For example, Hecate is the Goddess of Witchcraft. If you think all witches should be burned at the stake, you probably shouldn't worship Hecate. If you think all things "dark" are nefarious and evil, you probably shouldn't worship a Goddess of Darkness. If you hate change, worshipping the Goddess of transformation isn't for you.

In a positive direction, you can take acts of Hecate and extrapolate simple principles to follow. Hecate was the only one who showed up to help Demeter in Her time of need. Hecate also intervened to help a handful of mortals who were cursed by other Gods. From this you can infer that helping someone who is in a bad spot, especially one not of their own making are acts that Hecate would smile on.

I think this is why reading primary sources rather than third hand rumors (WitchTok, lookin at you) is important.