Here it depends on how old these children are, if I give an example on my child, he himself began to ask me about cryptocurrency already at the age of 11, and at the age of 12 he was already helping me do some things on the Internet, now he is already 14 and we talk with him almost every day about the movement of the market and about trading with investments.
What is all this for? and the fact that if your child himself shows interest, then he needs to be helped and directed to study at least by watching videos on YouTube, but if he does not have the desire, then I think it is better not to interfere with him.