How to discipline a 1yr old?

Please help. How can I discipline my 22 months old? She tries it!!!! When we are out, she screams, kicks, pushes things away and just acts out. She does the same thing indoors too. Is it too early to start disciplining? How do you do it? I don’t want her growing up to be one spoilt brat as a teenager

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I’m posting this anonymously incase I start getting judged for thinking of starting to discipline my child