In the days when learning forex trading, to make learning pragmatic, some forex exchange platforms give room for traders to have demo accounts to hone their trading skills and all that.

I am aware there are over 150 cryptocurrencies exchanges, but I have never heard of one giving traders room to have dummy or demo account to become better.
(If you know of any, please share)

Could this be as a result that forex trading is more technical or complex, and as a result, gives room for demo account?

I happen to be in a group that has to be with Bitcoin or cryptocurrencies in general. There was an argument recently, for and against, about the fact that non-existence (if possible) of Bitcoin would render or make Ethereum (and other altcoins) useless.
The stronger argument which is for Bitcoin had it that if it happens that there was no Bitcoin again, other coins/tokens would also stop having values. They might justify this because bearish trend in Bitcoin affects almost all other, and for other related reasons.

In my own knowing, I knew that Bitcoin came on the scene the first, and that the idea of it inspired Ethereum second, which gave platform for many Ethereum-based tokens, and there are also other platform-based tokens also like Wave, Stellar, etc
Could all of these starting from Ethereum still exit or useful if Bitcoin wouldn't be any more?
The answer to me is in affirmative, but can anyone lecture on why not?
Insightful answers please.

Before long Imtoken app started having wallet Bitcoin wallet aside the Ethereum wallet it used to have.
Now, in the Bitcoin wallet inside Imtoken app, there is the Main Address and then Child Address, different from each other.

Can anyone who knows the difference please elucidate on this? How are they related please?

I have read about giving as one way to be blessed.
Giving can come in form of anything; it could be giving of your time to a course; talent and gift,  resources and so on.
I am sure of one thing however,  giving of anything can increase your own happiness and good feelings, but is giving a factor to becoming wealthy? I am aware of the Forbes list of the richest, I am yet to hear any of them attributing his wealth to giving away if his resources.