If I want to make a choice based video game-

As in with gif (or other) animations, then a multiple choice, and then on to more animations, what do I need to learn?

And do I need any OPENGL skills?

Sounds like all you really need to know is Flash. That has action scripting language that lets you make some basic games. You’d be surprised what you can make with Flash…

OpenGL is not necessary for what you want to do, its a graphics API so you’d only really need it for the rendering part, but if all your using is gifs then using OpenGL would be like using a 2ghz processor to run microsoft word just my opinion

Its also a good start for learning basic concepts needed for games programming