What is an excellent(easy to use) animation program?

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I seriously want to get into the animation scene, but I don't know which program is best for that...I've tried using Flash before but I just found that to not be all that great. Of course, this was years ago and may have changed over time so I don't know. I want to get into animating to make a promo for CJ(may be a pipe dream but I'm gonna try!), make lil shorts, and etc. What would y'all recommend? Thank you!