Energy ripping is basically just using foundation meditation as a weapon, its honestly very easy it justs somewhat advanced because if they are spiritually stronger than you, their aura will retaliate and you will suffer.
Honestly it seems pointless to me, anybody I would choose to curse I would have 0 interest in having any of their energy whatsoever, it would be an outright downgrade but its a useful skill to learn so that you can feel when it happens to you.
Heres a tip to prove it to you, do the foundation meditation for 30 minutes build up a lot of energy and then pray to Satan or your Guardian Demon to take this energy for Satan's benefit I call this tributing energy, you will then feel your aura drained, when a Demon does this its not unpleasant but it is very noticeable, once your aware of the feeling you will be aware if its happening to you.
Bonus points its a noob friendly way to assist the Gods I did it loads when I was new.
After that you will know its a legitmate technique, but IMO I wouldnt use it on people especially the enemy its like eating sewage as their souls are dross.