Tantrums, what to do?
When they are so young it is hard to really reason with them. The best thing I found to do it redirect. If I needed to say no to something I tried to have a yes ready. No you can't bang on the tv with your toys, but you can bang on this big box! Isn't that fun?!
It's frustrating to be little, keep that in mind. They have very little control over their lives so when you need to deal with that frustration just redirect if possible.