If any games I made in TGEA can it be use in Torque3D as well?

#1 Sure, T3D is just the next version of TGEA, so all you would have to do is port over any scripts, code, and data.

#2 But I found the TGEA demo's script are quite different from TGE if I know much about TGEA will I get to learn T3D script easily or am I worry too much..??

#3 The scripts themselves are different, but the scripting language is basically the same. Things will necessarily change because the engines under the scripts change, so you should expect that, but you can port any game from TGEA to T3D.

Also, if you have code changes, you will almost definitely have to change code for it to work.

#4 This would be hell lots of work to do if one are solo game developer which I considered it's not flexible enough as the introduction ad I were having an impression where I have to learn 1 language then done all of it but looks like the actually sequence isn't that idealized.