@pob13
Don't think if them as "bad behaviour".
Think of it as the final presentation of extreme frustration.
Imagine you're in a shoe shop, and you want the Blue shoes this time. Not the red shoes you always buy.
The shop assistant, without asking you, brings you red shoes.a bit exasperated, you ask her to bring you the blue shoes. She brings you different red shoes. You get a bit more exasperated and ask again for blue shoes.
She ignores you, and brings you red shoes again, insisting that are the right ones.
You get cross. She insists on giving you the red shoes and tries to make you pay for them. You get angry and leave the store.
Now just imagine can't leave the shop or control yourself at the last point of frustration. You bubble up and burst out and scram at the lady, and she calls security and they escort you out if the shop and say you can never shop here again.
That's about what it's like for toddlers. But worse.
Toddlers can't always communicate to you why they're frustrated. Adults often ignore their wishes. . And their feelings are ignored, or worse they're punished for expressing a negative emotion.
Try and get them before the tantrum (not always possible,I know) but watch out for warning signs.
Make a decision about the battle you're about to have.
Eg do they ABSOLUTELY HAVE TO wear their shoes right now? Do they absolutely have to wear those particular shoes?
Often times, the battle you're about to wage doesn't need to happen. For example, they can walk to the car in their socks, and you can put their shoes on later.