Dedicate your name or that of a loved one in the holy Zohar and writings of the Ari, Zat'zal
The merit of Torah study will be eternally inscribed in your name or in the name of your loved one
There is no greater merit, spiritual elevation, or lasting memorial than this. All merits gained from the Torah study in these works will be eternally attributed to the donor and for the elevation of the soul of the departed. Fortunate is he in this world, and it shall be well with him in the world to come, may we merit his portion (Yabia Omer, Vol. 8, Yoreh De’ah 32) (Mishnat Rabbi Aharon Kotler, Yoreh De’ah 32).
"And you shall deal kindly and truly with me" – Kindness done for the deceased is true kindness, for it expects no reward