You can learn on either. The Fundamentals 1 & 2 courses on GT are fine with electric. Electric is also easier to learn with for a myriad of reasons, but, you will also need to outlay on an amp and TS cable unless the electric is a hollow body with some acoustic generated sound. 

Small amps or amplugs are fine for learning & practice, and affordable great sounding options abound.

Here are four.

(i) NUX Mighty Plug MP-2 (advantage of direct plug in so doesn't require a TS cable) 
(ii) Blackstar Fly 3
(iii) Blackstar Debut 15E
(iv) Blackstar ID:Core 40 V3

Any of the above will perform well in the learning & practice roles. The latter (iv), which is my second ID:Core 40, will serve purposefully for an aeon. I have and can personally recommend  i, ii & iv as of excellence exceeding user expectation.