Demo is important but one thing which you can't learn on demo is - emotional management. For this, you need to go live. You can start small with a micro account.
Yes!
Demo trading really helps a lot in understanding the working of the market. And it's always advisable - " Never to jump into live trading without practicing on demo account."
For the beginner, it is always good idea to start trading with major currency pairs like EURUSD or GBPUSD, so that you can observe them and get to know their pattern like uptrend, downtrend, and many more.
Using leverage gives traders the opportunity to increase their initial investment in order to play big but high leverage is also associated to high risk and that's why I believe, 1:30 is the best leverage to get started in the forex market.
With the help of a demo account, you can
-Learn how to trade risk free.
-Learn to manage your emotions.
-Create, develop and test your trading strategies.
-Find the best trading routine that suits you.