Assets that are immovable could be transferred through a duly executed gift deed. Except in case of Muslims, the deed needs to be registered.
Another option is bequeathing through a duly executed Will. Registration is not mandatory. However a Will takes effect only after the lifetime of the testator. Moreover, a Will could be revised or cancelled or revised at anytime during the testator's lifetime; in case of two Wills, the latter one prevails. In certain cases, a Will requires to be probated.
Gift as well as Will deeds are required to be attested at least by two witnesses.