How to discipline angry toddler?

my son is 17 months and as of lately has been very aggressive and lots of temper tantrums over little things. I started spankings from 12 months on when I knew he could understand the word no fully. But it seems the pats on the butt are not working and it’s more so encouraging him to hit back or hit when he is mad.... show more my son is 17 months and as of lately has been very aggressive and lots of temper tantrums over little things. I started spankings from 12 months on when I knew he could understand the word no fully. But it seems the pats on the butt are not working and it’s more so encouraging him to hit back or hit when he is mad. What other forms of discipline might be effective?
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