Pretty much all old timers are no longer making money, we don’t hear about new books about them, new names or great trades.
Now we have computers, regulation, margin restrictions, erosion of arbitrage opportunities, etc.
You can’t hold through large drawdowns that some of them survived.
Everything is different.
They may teach general concepts of trading that cannot support anyone’s lifestyle.
And now we have tons of free info on the internet and YouTube, and general awareness of all of the above.
The only training worth considering would be from one of ET members whose handle starts with @d, but he may be too busy, trading.