One thing that has helped us immensely with our two-year-old is actually a technique we learned through speech therapy, believe it or not!
When our son gets super upset about something - like we're leaving the park when he wants to keep playing, or we won't let him dump out all the Tupperware, etc. - instead of trying to physically pick him up and remove him from the situation (which often escalated the melt-down), we now get down on his level, gently hold his hands, look him in the eye, and start naming body parts.
"Oh! Look at your big eyes! They're so upset right now! And your forehead is all wrinkled up! Your feet are wiggling too!" Acknowledging the emotion and really seeing him seems to help him regulate his feelings and calm down enough that we can then move on to the next step of problem-solving or leaving the situation.
It also buys us a minute to quickly and calmly explain why we're doing something he doesn't want (e.g., we have to leave the park because it's getting dark). We've found that this technique really helps him regulate his emotions and makes transitions much smoother - which as parents, we have to do every day! Give it a try! It's such a simple yet powerful tool.