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Animation is fun and easy!
There are many programs that provide you with the tools
to make animations in both 2D and 3D.
Some of the 2D programs are:
CrazyTalk Animator by Reallusion
Some 3D programs:
If your interest is Comics then here are some programs:
Clip/MangaStudio by SmithMicro
There are many other programs out there but these are some of the popular ones. It all comes down to what you are trying to accomplish. In that regards, research what you want to do and pick the tool(s) that give you the best workflow to meet your goals.
Have fun and Animate!