I agree with the choice of the author, after all, these are top crypto-currencies and who would not say that some of them are centralized, we have the task of making a profit from them!
Hodling is suitable for people in the event that they have a basic income in addition to this, and so you still need to periodically fix the profit and change to other assets
The topic was quite properly explained the reasons of failure in trading, you need to seriously approach this problem in terms of setting precise goals and to remove the excitement!
The use of bitcoin is just beginning to gain momentum and will show more value, it's a matter of time, it's a great payment system and exchange of values on the Internet!
To study the trade you need a lot of time, because the market will not always go exactly as it is written in the book, it is important to set precise goals and approach with a cold head without emotions and excitement