Yes; firstly trading in demo account can boost confidence level for a beginner trader, it will be so very helpful to start in real trading, who newbie trader firstly jump to trading in real account, it's higher chances to lose initial fund in their first trade, because they did not any practices about trading, my trading journey started with demo trading and after several months i entered in real trading.
Their is a lot of importance using the demo account before using your actually money and I love the idea that the demo account is been put in place, their is going to be a lot of learning from that demo, and the confidence even when it comes to making risky decisions will be their you will fear nothing but when it comes to actually trading you have to fear so things. And this feature is actually for newbies and I know that their are people that will not really like to start with a demo account but it will only put them at a disadvantage, their more experience that you will be able to get from demo will just be like a safe zone for you. Because it's is just as if you are training with rubber bullets to reduce the chance of death when you train with actual bullets. My teacher also encouraged me to make sure I use my demo account every time before I started using my actually balance to start trading.