Alot of people ask this question often if they can actually learn to trade the forex market with demo account.
Well the truth is, forex requires both skills/strategy, Psychology and money management.
Out of these three essentials, DEMO account only make provision for one and that is SKILLS/STRATEGY
With the forex DEMO account you wont be able to completely perfect the other arms of forex which are even more important than strategies itself.
In summary Learning forex can be okay with a demo account but if you want to fully perfect the fullness of a trader and beome a pro at what you do.
Then you must learn to go real as soon as you perfect a good strategy
For a start you can use a small balance and with time you can increase your stakes and gradually learn to become more in control of your funds and also your emotions
Cheers and wish you best of luck as a beginner